Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c81e8035108b3f…

MALICIOUS

PDF

69.1 KB Created: 2021-01-27 07:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 57279e8ebcd912ce870f0f26a10c5e23 SHA-1: 533adbadc233e40d905849b676528b4c38df15be SHA-256: 82c81e8035108b3fcf018fe4e34fcfd49b521e554eafa94932740085c2508e58
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and a heuristic indicates it's a link farm designed for SEO manipulation. The presence of a 'download button' lure and the ML classifier's high confidence score suggest a malicious intent to trick users into downloading further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wb?keyword=amazon%20music%20download%20all%20songs PDF link annotation
    • http://afracheat3.xyz/mega_man_6_mobile_apk_free_downloadqambt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368984/normal_60076c82f2512.pdfIn PDF document text
    • http://bloodcraft.online/71629223019jqjue.pdfIn PDF document text
    • http://timelessdecorum.com/doll_house_cake_cookingi9ae8.pdfIn PDF document text
    • http://copyright-rules-help.com/the_7_undisputed_letters_of_paulpzz9q.pdfIn PDF document text
    • http://xozonline.ru/pathfinder_kingmaker_headband_of_vast_intelligencexo4w2.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/hfGywVA/39757699602.pdfIn PDF document text
    • http://center-about.com/bavutokoxunamitulebyi4d8.pdfIn PDF document text
    • http://esmoney.site/strategic_management_process_in_orderk01e3.pdfIn PDF document text
    • http://espaceabonne.com/duderakemwts6q.pdfIn PDF document text
    • http://uchebnoe.website/791951014531k0z0.pdfIn PDF document text
    • http://center-about.com/jalezexuruguxopiritame34kbo.pdfIn PDF document text
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/biduserarofoguf-zubumasuzoma-foketivosugu-femozasemiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/3ifjcTV/apple_dessert_recipes_gluten_free.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/5161f6df04dc.pdfIn PDF document text
    • http://hydra.moscow/vokudaviwejogotateguwavob4h2.pdfIn PDF document text
    • http://sbrf.link/moberelufofge4lp.pdfIn PDF document text
    • http://agencymedia-ig.com/among_us_wallpaper_makerath00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 5292 bytes
SHA-256: d822a08602dd488405a367ddfe152cfa0c6127a5f9217955f6197e27b2625b5b
font_01_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 10252 bytes
SHA-256: 5f2fe09549459e901ad2f6bba0e1e120881def106bec1cc71651551301977b95

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