Malicious PDF — malware analysis report

Static analysis result for SHA-256 6308f3f4aeb6f22d…

MALICIOUS

PDF

81.8 KB Created: 2021-03-22 13:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dfc7238c5383cfbf2705d2e0e5880a9f SHA-1: ccc5357e1929f0bf495489bb9d35747a8e6a5965 SHA-256: 6308f3f4aeb6f22d59aab9ff2005eb4d7d27373a819a0892b83a73e4109b32c3
186 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the heuristic firings suggest the primary goal is to redirect users to potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=ejercicios+de+angulos+alternos+internos+y+externos+pdf PDF link annotation
    • http://anarchymedya.com/twas_the_night_before_christmas_poem_short_version_printablemutxb.pdfIn PDF document text
    • http://show-visitor.xyz/fotomokojolo8cv.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/hchbYjj/zufibavuvogevoguzopige.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/eyZohdd/39311571249.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/biiichg/single_dp_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/IicyHif/biophilic_design_stephen_kellert.pdfIn PDF document text
    • http://metalllift.ru/xowibakurx59h.pdfIn PDF document text
    • http://esclick.pro/jofewasakzh67n.pdfIn PDF document text
    • http://purpless.vip/bivopujakk3bzy.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/CjfQkha/vabimerozebir.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/cIheZIN/sitapisiwoleb.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/e7c22886-beb9-4349-b9c2-8f9c67ecc850/66696027301.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_998fe8ea39274e079049a2f3408201ed.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_da6bcff552364850be4ce3935b43c5f3.pdf?index=trueIn PDF document text
    • http://besevinoferoza.epizy.com/lopukugidediwokobifavaj.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_7ae6235a3ab242dd912e8dd0ee47fb04.pdf?index=trueIn PDF document text
    • http://sarozaxag.epizy.com/capacity_planning_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad16ffd4-e0b4-444f-b1ad-cf43f7525636/55170444465.pdfIn PDF document text
    • http://gukasitaxe.epizy.com/steam_games_to_external_hard_drive.pdfIn PDF document text
    • http://wavaloseteto.epizy.com/metro_train_stops_los_angeles.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 5528 bytes
SHA-256: 14861815c1c83120160b9e4552c3dc147235c36704c839ec828085755d861cae
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 12360 bytes
SHA-256: 8a8cc6ad07e8972c4ef6b2e2241be831576e8a9e6977e5ec1582f77ba3f98411
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 16244 bytes
SHA-256: 3bedba6a5131d64724691d1b8684e83b0f7d1d8919fb3d5066b8f2966c1b58e8