Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a8d6753921b254…

MALICIOUS

PDF

97.5 KB Created: 2020-12-16 11:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 48d9e0b6e96206d1f0e5c09de2009743 SHA-1: 244e7a8f7f1b7ba9208579fd7de44a7ce6417f71 SHA-256: f0a8d6753921b254cd4f34c3066e95ccf3966128fcf38f55aad94f22a07ab54b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically flagging it as a "PDF_SEO_LINK_FARM". The document body, though heavily obfuscated, appears to be a lure related to "Manifiesto del partido comunista karl marx". No scripts were extracted, but the presence of numerous external links suggests a potential for redirection to malicious sites or further payload delivery.

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/123?utm_term=manifiesto+del+partido+comunista+karl+marx PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8ac6007a8e3.pdfIn PDF document text
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/dfd31d261e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418783/normal_5fc9aa747156e.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/683481b7-fce9-4443-b96a-46f1bb9129a4/bisasekikerowopenenam.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/44504339540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d201ce-0f79-4803-b71d-51e95df2d9c0/special_event_food_vendor_application.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/netezabulajewudelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbd2206-23d2-4282-89eb-04c5cb1d735f/sagasixivadudipasetirenox.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/36401052056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edc5b52-0a23-46c1-a94a-d3cb1dbf3cb7/zixamidogumazovipunod.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/anne_marie_friends_song_djpunjab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc321a1ab79f442f238200d/t/5fcdea4f2bc7884852d869cd/1607330384144/nozowuwejiruzamuwukakiko.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_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 5436 bytes
SHA-256: db824fe7704ebc2a0b1866b53562e722e153a6a71aa3a9281479c73dda7b93c9
font_01_sfnt_off000152af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AF 11696 bytes
SHA-256: 88dbf323426d785e82aa689b863cf7f7345c538ebf3c353c028c1f903960619a

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