Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d89f98a1693967c…

MALICIOUS

PDF

72.4 KB Created: 2021-01-04 06:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 58be0c28c413110d370c29d1349c8c52 SHA-1: b12d8fc6de44c77c84710dca0ddf875a37772ffe SHA-256: 7d89f98a1693967c2d261678b4415c81411103705fab9d7482dccd0cdf68799c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with several pointing to disposable hosting services, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to manipulate search results or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/123?utm_term=610+sports+text+line PDF link annotation
    • https://cdn.sqhk.co/wazafanez/chbazgg/39386357560.pdfIn PDF document text
    • https://fukituxepuronip.weebly.com/uploads/1/3/4/6/134605821/sexid_pezakored_nipasumelunim_fonapezobi.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/kukosedopusudowu.pdfIn PDF document text
    • https://tonudekosinin.weebly.com/uploads/1/3/4/6/134685286/9a570d.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/votowav.pdfIn PDF document text
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/mozetofugidar-kejujapesobuwa-veterexutoj.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/785f02877.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/nesanudulubu.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/jutenojamega/words_starting_with_xl.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/85438654696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f213d8-6464-417b-93b9-eab41a32823e/69278051838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a08c4475-0717-4ccc-aab9-9f3552e11e19/99427028958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd6fa29-5254-402f-860c-fba06bd41185/bakugan_battle_brawlers_apk_free_dow.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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 4924 bytes
SHA-256: 20360dfbbbc60423de1f39b461796d95040dda9d034b68a5c21ea93c692e983b
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 11208 bytes
SHA-256: 5f862887a2e029859336e0f44c6547328bdd34734cbe9502fa17bb2814ffee45

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