Malicious PDF — malware analysis report

Static analysis result for SHA-256 50131920928e241f…

MALICIOUS

PDF

91.4 KB Created: 2021-04-01 21:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b9ff62a6e7ba22ef1e972cde9e033914 SHA-1: 5d8aec23b05fef33e8f1d2b9fef73036ead20538 SHA-256: 50131920928e241fdc33c524be4443d6017a7a66636f23d5cafcc05c13baca7b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute traffic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests it is used to lure users to malicious sites, likely for phishing or to download further payloads.

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://gimoguvi.ru/strik?utm_term=modern+haggadah+pdf PDF link annotation
    • http://kofodotig.sportsontheweb.net/tozawolowuta.pdfIn PDF document text
    • http://bhd-management.space/tozegokehcmfj.pdfIn PDF document text
    • http://fkpravo.ru/viworrflfg.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/areal_differentiation_in_geography.pdfIn PDF document text
    • http://walawatomu.mywebcommunity.org/arthashastra_in_urdu.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/vodafuwimujat.pdfIn PDF document text
    • http://brandframeb.com/cooked_meat_temperature_guidenlejw.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/franais_anglais.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/b17e8652-bb90-43c3-bcda-5821f1339f19/how_to_convert_cfg_to_cnf.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_e44eaad817b74c8f924525483e510c26.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_151912f6d3794721854e2a62686f36b0.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_c7ad59c5f97345f1967c501fec6ba448.pdf?index=trueIn PDF document text
    • http://kexomun.myartsonline.com/showtime_rotisserie_turkey_breast_cooking_times.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_50b299384df3410eb1c5da7ccd3f3ed8.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_5018025d2c8a48be9505351f317f5df9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00fbd25-3e07-4b00-a8e1-1fb784e5de91/what_is_the_best_baby_high_chair_to_buy.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_f50dc478ff284446b689ff89a33f96df.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_830fea7f196741d2aecbbe442dc5a6ba.pdf?index=trueIn PDF document text
    • http://robefowoved.onlinewebshop.net/western_blot_protocol_invitrogen.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_e823af90e5f944cdab6de2d6e9aed829.pdf?index=trueIn 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_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 5096 bytes
SHA-256: 4c245ffaafdee14f6dcab117838f7e49da628c85e73bb0ce0e0e4d3487f401db
font_01_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16244 bytes
SHA-256: 5fee09a9593843fef129ebe15c348c2bb82be9473c6e4dd9881dd0402a53c0fc