Malicious PDF — malware analysis report

Static analysis result for SHA-256 de791bb1543d6ee6…

MALICIOUS

PDF

80.6 KB Created: 2021-05-19 06:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38d90ec68b695592ae58d3b85983e0a1 SHA-1: c9b0cba8a9587bee08fcd9b4a8f7621347f87e30 SHA-256: de791bb1543d6ee6d3dbb06fe258ae33813119574f904e004e288d3617e48ed0
186 Risk Score

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 0.9997

Heuristics 6

  • 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 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://seumenha.ru/strik?utm_term=how+to+use+the+clearfield+doctrine PDF link annotation
    • https://jiraxoxaxizare.weebly.com/uploads/1/3/4/0/134012395/xokakav-tutadubefet-kigakit-dimab.pdfIn PDF document text
    • https://fodewifejala.weebly.com/uploads/1/3/4/4/134491976/bfbd0301da3ea4.pdfIn PDF document text
    • https://renefifukidib.weebly.com/uploads/1/3/4/3/134343870/ba52942d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382418/normal_606e1c07c49c9.pdfIn PDF document text
    • https://bevubulik.weebly.com/uploads/1/3/2/6/132680874/naloko_meboxidasu_vipelewaf.pdfIn PDF document text
    • https://bitoranajezope.weebly.com/uploads/1/3/1/4/131453137/tomosidowemusukenex.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/jejobur.pdfIn PDF document text
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/mojupesaduron.pdfIn PDF document text
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/nasugasola-sadokukofapazun-gupizaxux-xenolikipot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465398/normal_5fc772c65f96c.pdfIn PDF document text
    • https://sonotipudo.weebly.com/uploads/1/3/4/3/134326760/3836621.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/0ea28953-8a6f-46c0-88c4-81fe1399d98d/how_to_sleep_fast_us_navy.pdfIn PDF document text
    • http://zuvidetalenaras.epizy.com/xevotajurijasowoterowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e4b0c0-8924-4965-8468-c4c4d2f548c1/ruger_lc9_magazine_extended.pdfIn PDF document text
    • http://botejesojami.epizy.com/tazubusubuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a363b291-f3a9-47f5-8edb-84a11e3d77b8/17835934396.pdfIn PDF document text
    • http://naperopumo.rf.gd/sennheiser_ew_100_g2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349b786c-f018-4d49-9710-02d295812c12/wazinipixadigafab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89eb1489-68a9-4089-84df-ba66485c3a33/the_hiding_place_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be538f5-95ef-4c88-8771-1ee680af34ff/why_is_my_sprinkler_valve_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f01a44-3943-462f-b268-2ff84d14d6f4/lowrance_hook_5_hdi_user_manual.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_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 5160 bytes
SHA-256: 80fc5e607965d921eb3399366abb3801df5d8cd7d9125d2370171c6e0aa7c455
font_01_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 12012 bytes
SHA-256: c8fbbec37c3f366b3d0b8a6df2bb7551f6691bf91bfcb5dc7514a68d1d1af2f8