Malicious PDF — malware analysis report

Static analysis result for SHA-256 178df4c33308d7ee…

MALICIOUS

PDF

103.8 KB Created: 2021-04-01 10:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3941f63343801129310537acf743bab SHA-1: 22419d241599787c864ced1dd1e62ddc00fd1d88 SHA-256: 178df4c33308d7ee84637be53895157e5ea1efdac6db4f785018ada209ba43ac
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a suspicious domain ('dafemum.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dafemum.ru/123?utm_term=5e+alchemist+character+sheet
    • https://cdn.sqhk.co/vovewotutal/TidE9U2/jumpshot_coloring_page.pdf
    • https://cdn.sqhk.co/dasisogi/cievihM/simple_electric_iron_circuit_diagram.pdf
    • https://cdn.sqhk.co/tazuxalana/sJefidt/arcane_quest_legends_mod_apk_1._1._8.pdf
    • http://koprovk.xyz/huascar_ynoa_scouting_reportp8lcx.pdf
    • https://cdn.sqhk.co/govonesed/NvBhdgU/geometry_dash_steam_key.pdf
    • http://inertbhjbj.ru/74486910648ymht.pdf
    • http://calipshatngaccs1.xyz/how_to_take_apart_rainbow_power_nozzle8sd4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d692b82a-d563-45ba-818c-0512d98079dc.filesusr.com/ugd/1c7397_da4828ceb67b48abbccb3b4bdc882eb8.pdf?index=true
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_c09e9bf08a30433a80ade4f705075a0d.pdf?index=true
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_eea0317d44c143b2b37caf9f3ebdbdee.pdf?index=true
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_5b96dc684a0a4342b38d4e444b3c68d0.pdf?index=true
    • https://s3.amazonaws.com/vixuwogetiv/69474104113.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_e149b4033b39467795145c59eb655569.pdf?index=true
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_4cc53bf4966940d1a16062d09867a0fd.pdf?index=true
    • https://s3.amazonaws.com/ladiwuzetawedi/ziviwinisal.pdf
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_33d09fcba03f4a6597669fd5966327ef.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ef3.bin
2c1547c4c4ab7417727e5c4938036c558450430292601ee72f98fc14b89f9012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF3 5068 bytes
font_01_sfnt_off00014ffc.bin
adbeb36391d7b5227e1831311c3d5059aae475ce6af65b8144c66b89b47cf7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFC 11424 bytes
font_02_sfnt_off000176f7.bin
98ea238061e020dba0cf30cd776132e98da18bc3027e8b23482e8a63438fcd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176F7 17588 bytes

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