Malicious PDF — malware analysis report

Static analysis result for SHA-256 8992097ab035231d…

MALICIOUS

PDF

67.4 KB Created: 2020-11-20 15:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4acd44fb0b90f3471a79c8ddc2e29c10 SHA-1: bfff84caedf25a64b43ad284f7ecb176aca321f2 SHA-256: 8992097ab035231df29dc6254878b47a9f0cb003a6164304bef6d3767cb9a74c
254 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. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ggtraff.ru/strik?utm_term=the+way+of+the+shaman In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5f9cd6c750376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8f8a609059c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_5fa2a6bece35c.pdfIn PDF document text
    • https://zifotafevulifo.weebly.com/uploads/1/3/4/6/134648418/kabel.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/jixineso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f8d07b686409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_5fb7468e235eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5fb762474b001.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/topolalibomabajili.pdfIn PDF document text
    • https://fejagirizow.weebly.com/uploads/1/3/4/5/134525681/nupozovetikos.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/ff69c23d-ba10-4f04-be5e-386e3e9a1e3e/tozajodidojiwiwarik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed2d6b5-4dc7-44dc-a5f1-a4ff7d554455/76912991193.pdfIn PDF document text
    • https://s3.amazonaws.com/gusaledikugumo/what_is_an_example_of_continuity_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/gekinonekifixesij.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_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 5020 bytes
SHA-256: 08265ff1f2eddb7fe1a9f551635e95ae7e9426c63023c7e354b8390d43dd080e
font_01_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 10652 bytes
SHA-256: 1372facc0f95e124f43ab2d2716b1a1a6c7d07ebeeedb6fa6b496c50172e0137

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