Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe16ede87d7cd03…

MALICIOUS

PDF

77.6 KB Created: 2021-05-29 06:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4114ab2a742a6a44b7cbb33b51b4205f SHA-1: c24e45356c14911204857d5b7d326c61008fbb17 SHA-256: 9fe16ede87d7cd030e77bf885125115d482947544ccbd2652df441dfbd64c6f6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to leverage embedded content or external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=mcgraw-hill+ryerson+chemistry+11+textbook+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373243/normal_6052aa6851e3e.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/wepiterokib-xeduratavusegis.pdfIn PDF document text
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/7338837.pdfIn PDF document text
    • https://midinomuxew.weebly.com/uploads/1/3/5/3/135391973/rikejozomivilog-limevu-gonatozowakor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5fd1c4dde747e.pdfIn PDF document text
    • https://kebakikuvoti.weebly.com/uploads/1/3/7/5/137513313/7844964.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/zelogedewivot-xalukomonawe-tuxosagoboxeze.pdfIn PDF document text
    • https://xebokedobonu.weebly.com/uploads/1/3/4/7/134719403/tajewimubuxe.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/b109160d5ce96.pdfIn PDF document text
    • https://fujokexa.weebly.com/uploads/1/3/5/3/135304253/abb5b46b43841ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_60270ece96f38.pdfIn PDF document text
    • https://xenapake.weebly.com/uploads/1/3/4/3/134353424/mixenuzokexilone.pdfIn PDF document text
    • https://zusiwugebibod.weebly.com/uploads/1/3/4/4/134484471/3805e7f59a871c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374519/normal_5fce0f22e5fc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412773/normal_6006ff9f6fd4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a40b7990-d022-4bce-9284-a61a61afda87/570067033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d741a2b-4a2d-46ce-8841-537946f1915a/zukasevugumozinosenim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0889ab1-900e-445a-bc4a-909d70753f41/96235091757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa956d71-e4d8-415d-9b96-ee745eab5ab1/how_to_set_alarm_on_armitron_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb182a46-7353-4d42-adc4-84bc50f02bb3/what_is_tcp_ip_in_computer_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e8315c-dd5b-4ba6-9d43-17f33580b74a/kadufosesaduwasosawudeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07ced4c-f43b-40ac-a59e-722196c0ec6e/what_is_canadas_national_sport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dd34d2-7793-4aec-85ea-1cc8152c000a/fate_system_stunts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb4b82d-7ce0-4dba-902c-99903ed5a4d3/94568062041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bf3408-73e4-4cc9-964b-7b29aae47ba3/dalupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b016c3-3a69-4cbf-9d65-1f8371f37aca/69286452947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3047774-cf04-44f3-acbc-682edafd6eb1/what_is_liminal_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98f3f22-d6b6-4257-8958-13f76d18fc2e/10748975002.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5556 bytes
SHA-256: 638d3abdf3ad1b6d001c22d4dc2467381d867fdabf13f0444dc2edc75e792c19
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 11184 bytes
SHA-256: 617429ab968057f97848032b76e853cc9bfcc6b9cb994117a2457e250d5b5d33
font_02_sfnt_off000119b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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