Malicious PDF — malware analysis report

Static analysis result for SHA-256 39adc90858c0db9e…

MALICIOUS

PDF

103.5 KB Created: 2021-05-29 21:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 61c2ea3a3e6b4dbcb53df8019839eac8 SHA-1: 1a3f8d7b42013bcc98ecf7addc86154ea8c5a5de SHA-256: 39adc90858c0db9e6d5a65414b7d441a1be0bf0e83d750c1865f252dae44af99
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=cellular+respiration+amoeba+sisters+handout PDF link annotation
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/1523473.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/b9db1a19ae.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/4288951.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/pobak.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/gimikodidid_bitojifebax_geduguwake_pewejiliko.pdfIn PDF document text
    • https://bisomimimuj.weebly.com/uploads/1/3/4/5/134526732/8636937.pdfIn PDF document text
    • https://gazukevofuw.weebly.com/uploads/1/3/4/5/134597640/36ced463.pdfIn PDF document text
    • https://mifevulesitiz.weebly.com/uploads/1/3/5/3/135321383/3be2df4305bc7f.pdfIn PDF document text
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/8883573.pdfIn PDF document text
    • https://nasejanebuxilas.weebly.com/uploads/1/3/1/8/131856105/luxonipuwukixijemax.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/5496845.pdfIn PDF document text
    • https://dararokipo.weebly.com/uploads/1/3/7/5/137518135/2398325.pdfIn PDF document text
    • https://lorivomewojesab.weebly.com/uploads/1/3/0/8/130813497/gokobadif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0c7b1b-6e34-4273-a45c-31afd921c94c/32756467029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705bcd3f-7b34-469c-9592-0caf1d24611c/in_what_order_should_i_read_the_maze_runner_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a9a7be1-1ab1-42ec-bfa9-fc4ac2f07338/romudatifowavuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1785d312-e41a-460f-a154-ce8e1c446890/geet_gaata_chal_full_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4e26cc-5f1c-4588-8e82-e8f8b836d163/97643396096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b7c782-ee6e-444e-b1d3-e5a239d2eda9/cross_functional_organizational_structure_advantages.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E8 5244 bytes
SHA-256: b87f85ec83092653dd9389cd13fc09e21567b46a5fe985321c821475a6da3257
font_01_sfnt_off00016b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B84 10944 bytes
SHA-256: d25fa7b86cf045ae1c5a04da4c1e21d20c6c9480dc781f428791b10ef0d1f6ee

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