Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fda48237678bc1f…

MALICIOUS

PDF

79.8 KB Created: 2021-04-07 08:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b9c68a4d4a3ed2ea1127feb1f517389 SHA-1: 738efc8d9d736019a2eb7b76f7a38ba9de943d53 SHA-256: 7fda48237678bc1fd1339666fe23dacffed70922eaedf7278f67ac4f66fb4a8c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains external URIs and acts as a link farm. The embedded URL 'https://botokaw.ru/strik?utm_term=pathfinder+bestiary+pawns+pdf' is a strong indicator of malicious intent, likely leading to a phishing page or malware download. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/strik?utm_term=pathfinder+bestiary+pawns+pdf
    • http://particuliers-societegenerale.xyz/subterfuge_make_a_sentencevch1j.pdf
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fd6603205e82.pdf
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fc65700b7d73.pdf
    • http://excschool.ru/osha_sample_written_safety_programgt36k.pdf
    • http://instofficial.online/106677492906sli8.pdf
    • http://presente-top.store/inheritance_book_4czinj.pdf
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5feb5db86b09d.pdf
    • https://cdn-cms.f-static.net/uploads/4384828/normal_601fede67e646.pdf
    • https://static.s123-cdn-static.com/uploads/4418362/normal_5ff215d65de21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ca508ffc-81f1-4f93-ad41-ba40dd2168c2/reloading_kits_cabelas.pdf
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_57ea96fec17142ef87b67607009ef707.pdf?index=true
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_7b2f4cf44acc4ceba9d47b341b538fac.pdf?index=true
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_9d311f21a1184d67978b9821912c36c5.pdf?index=true
    • https://s3.amazonaws.com/bamepofewalada/sargodha_university_admission_form.pdf
    • https://uploads.strikinglycdn.com/files/c29a75e8-7fc9-4ec4-aff9-841d37833e31/vekorogukokowujoget.pdf
    • https://s3.amazonaws.com/fofeguj/43719716409.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/lego_batman_games_for_android.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_b6b0186ef8f0462d9a468bf85c9d3a84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c10b31a-544b-4905-967e-125a1f48b3a5/fomifubodorutofozo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa21.bin
b40efd75cb5168b89d96085236dbbf972c1064025752fe06f0f98fce2f36be85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 5432 bytes
font_01_sfnt_off00010ca4.bin
4ed6f2ed6c43810da0571b517582d32a4c5f5b0d9fc92fccd7b6fb75b34979ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10592 bytes

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