Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f264108c4e24ab6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 07:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 451800e8131b7b4405e15e609861bc3a SHA-1: 578c64cf96f729097ec8dd67d757ff28c5a03c06 SHA-256: 0f264108c4e24ab60b971548e2629e0a040f07ee4e93a044ac64ffb64d76fdb3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://pelibifir.ru/award?keyword=noun+verb+adverb+adjective+pdf PDF link annotation
    • http://tells.fun/how_much_does_it_cost_to_service_a_sewing_machinentai3.pdfIn PDF document text
    • http://santaparker.store/kasinevn6r00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fe313f74261f.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/xugodiwoxatuluwuwalus.pdfIn PDF document text
    • http://best-ital.fun/cheetah_keyboard_apk_apphan70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_600e509bc090d.pdfIn PDF document text
    • http://ragofilud.medianewsonline.com/81435002478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_26c3c5019682442c97dd9ce80f8315f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67105d40-75bc-41c4-ab1b-42c956962931/runujafomapusim.pdfIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/anorexia_nerviosa_tratamiento_farmacologico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb25250-a089-4b24-9f4a-55dbef732e70/the_magus_bride_episode_3.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_9bc521f134ac402fb1f902889ee405a4.pdf?index=trueIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/71516520286.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/cercospora_beticola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65289223-eedb-40d8-b9db-0a70bf2b349c/putawilisufin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcaa37f-f499-4f94-80ae-675e601dd171/nordictrack_commercial_14.9_reviews.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_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 5184 bytes
SHA-256: 7b6ac6768c141a07a6aaeee77d7d3d6321dd29de698ae8b70a74548de85dd6cf
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 10860 bytes
SHA-256: 2687dd9ef4f37171c38799358768714c52116dd618c52f29ec308982f189bbaa

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