Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0d24eb402f7fad…

MALICIOUS

PDF

73.9 KB Created: 2020-12-28 13:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8f6a5222c25624f73325e8ef29778f3b SHA-1: 954ef87617dd95105e55f9a9b020b0da0484de90 SHA-256: ba0d24eb402f7fad3f6c2f24848b8971bfdff71bf61f201f30c899473495013f
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://trafftec.ru/strik?utm_term=all+types+of+big+sharks+with+pictures PDF link annotation
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/kuzovikosegapol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_5fb7a55d31d2f.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/e3141385aa1ef.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/fudezudubedulo.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/o6vheRz/zogidetutelasomopalug.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/8633586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5f9eedc11bbf5.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/janidaderujofudimom.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/db9f4d04-8bd3-464b-b0de-a994f26f9c9f/dodge_ram_6_speed_manual_transmission_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/xasiwobazujize.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/acupressure_potent_points.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 5664 bytes
SHA-256: 8ad11eafd483e9f9482bdcc83bef0404cffbb99d9f43521f5ee30e92daacdf44
font_01_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 10296 bytes
SHA-256: e4fcbf1373efcf27e944014fbacdf59e1f0346fd122e506e09434bcd9734c5e5

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