Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3211cdd18722c03…

MALICIOUS

PDF

66.0 KB Created: 2020-12-17 03:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 896a2034c9196ade30ca0f37d0bf0414 SHA-1: 92b049db8c1a72241398bc40131fb9481b6e8ff5 SHA-256: a3211cdd18722c03d7ef281fe08ffbf35b994b06e8a76d7e4c5f9d400fc9ea89
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=write+equation+given+amplitude+and+period+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446394/normal_5fbf2011eb74f.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/4282990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_5f9fd0b6732b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_5fd317e125cf2.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fuzatolo-suvibesutisozuw-modipo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/present_perfect_verb_tense_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b5f37e-b5f8-4ced-8a0b-40fba3bd3bc4/gufavasopitarurupipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca61063-641b-4cf1-8046-9a5ee6c33e00/fikowuresojazawaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21192937-9268-4e5a-889c-8c4e5bab9ff5/natuvudelozedomir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f01f39d-717d-4fe3-82c7-e44e8d5d5c4e/mathematics_workbook_class_4.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/91113694629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920c73fb-5e0b-4113-9b2b-283de1f2104a/lunibasafupetoro.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_off0000c1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 5416 bytes
SHA-256: c4fdb437c4ed65a423c640d1b1da227528fb886aea7ede77622c912f4c877791
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 11304 bytes
SHA-256: 829be1e7719fd73ac0bdd65ed3cf3833832d342b7f8234d71982dde874b86fea

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