Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bc404ddba44e2b…

MALICIOUS

PDF

66.7 KB Created: 2020-12-13 22:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 794b5bacc238492c1c90bc29a3ffac4e SHA-1: da639b8a6f0e205971f98d66e6b59327bdef3037 SHA-256: 87bc404ddba44e2be981bf59743b4766d37efe3a1ad282d573f321e326a3bb04
156 Risk Score

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://traffine.ru/123?utm_term=secret+video+recorder+pro+apk PDF link annotation
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/nimojewalumoku-wubesolelo-wopaxomat-fogakezewitir.pdfIn PDF document text
    • https://natemavobu.weebly.com/uploads/1/3/4/3/134349428/dedav.pdfIn PDF document text
    • https://pegejapadeju.weebly.com/uploads/1/3/4/3/134355249/f292d47c.pdfIn PDF document text
    • https://pajujetijawu.weebly.com/uploads/1/3/4/3/134334360/5888178.pdfIn PDF document text
    • https://nitetemefugek.weebly.com/uploads/1/3/4/7/134772401/xikevu_jufifofipekog_rawipegewazi.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/wakulafezim.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/bifadiwuwileji/anticonformiste_8_lettres.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/autotune_5_rtas_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/microsoft_word_online_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/jowupoxapetafenejatoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1939ac6d964583626ee44/t/5fc3d369e6d49a06bb07813c/1606669162132/buvinenubelimasukejeluv.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/lesson_masters_6-_10_b_answers.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_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 5084 bytes
SHA-256: 95351db0fe51c45c72a116ded80e384bbc42d1f18862226c1302261c7ecb181a
font_01_sfnt_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 11592 bytes
SHA-256: 62679d0cb94941358b9d04720213ebcb4d2240fd63d15a45dd531d7a740e9612

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