Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd54891c6429450…

MALICIOUS

PDF

71.7 KB Created: 2021-01-05 22:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7dbfcf233a6c9b11e293e9621a92a9b8 SHA-1: dad125f53afbafaf85900b868b3442edf1be0d5a SHA-256: 8cd54891c642945095edcaa97a8e5be3b84d4302649c1606c86f4f5ed6a4a32d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=chemical+bonds+molecular+models+and+shapes+answers PDF link annotation
    • https://cdn.sqhk.co/ligazupevu/ibrdigK/30237748509.pdfIn PDF document text
    • https://vokedovewugom.weebly.com/uploads/1/3/5/3/135349322/f63180.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/dagifejitusati_xitosefeli_tosatobuweza.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/f4454e44-4e2f-4780-9f23-1e2174df475b/xizirogitixuvazodekivetaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb669c9-9cf4-481f-a84e-cc661544126f/nigaxodimebow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c12f207-9dca-4b33-9515-77ec45ec264f/rekimojopuzebabaxilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bd689b-67fd-4d48-b575-010587c889c4/giving_directions_in_spanish_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/bupipuragoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e373ce1f-f7d7-42bb-b1fa-315ab66919e0/66597271887.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/bitdefender_box_2_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373789a4-7787-4eba-b4f8-d72072c7fece/minecraft_ars_magica_2_1._7._10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a37ded-fe39-4fe3-8506-384e16bdff25/me_and_my_big_mouth_bible_study.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_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 5368 bytes
SHA-256: 55e597273d4f7a2c49ecf019848533e30e864c5271ed9f1b1a16b67d1c6fe7ce
font_01_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 10696 bytes
SHA-256: 7eed231ad319bdb56ccf26911520121733bfcae8c164ae5c549c380d0282877f
font_02_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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