Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ba7d46c1c6ede8…

MALICIOUS

PDF

88.1 KB Created: 2021-03-15 09:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 14859f9216780bfefc8d7dbedc3c0241 SHA-1: ad84535a03f8f105cd23dc0a90395d45204979aa SHA-256: 12ba7d46c1c6ede8c5aa7f8435a302f0ff8ad5c667d1db285d399e0a4b811921
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no direct instructions or lures are discernible. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=alfabeto+hebreo+en+espa%25C3%25B1ol+pdf PDF link annotation
    • http://normal-id.com/38274169621ft779.pdfIn PDF document text
    • http://microdigitalmeter.xyz/gi_tr_hiu_dng_ca_hiu_in_thr9qkw.pdfIn PDF document text
    • http://plafond.xyz/31068592725ompdp.pdfIn PDF document text
    • http://film123watch.com/what_heart_conditions_can_cause_high_blood_pressuremwktj.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hcichbr/special_agent_oso_characters_in_real_life.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/hjzjiCv/zejuton.pdfIn PDF document text
    • http://pagexonani.iblogger.org/numark_mixdeck_express_service_manual.pdfIn PDF document text
    • http://fruittea.space/550412541772xvwm.pdfIn PDF document text
    • http://save50it.info/11510596132ipjvh.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/638633e0-a557-4aaa-8598-508d3257af5d/9408806737.pdfIn PDF document text
    • http://xaxevuvu.epizy.com/74986256408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f82df1-ffe3-45d9-84de-4b0be9c6dbac/96625590809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7c7ef2-5a91-4a08-8f56-417235132a90/who_played_the_killer_in_the_green_mile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e5aded-3657-4128-a7a3-f855727317b8/gimunizafijegixivupomabuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c9874b-21b7-47f7-99bf-8f0ebb1ac4fc/korg_sv1_driver_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1a6bd8-2353-4592-b2cb-2002f7d4547c/especializacion_en_derecho_procesal_civil_en_medellin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a18f66-04f9-472c-9285-486ecfd12199/best_comedy_books_for_adults.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_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 5472 bytes
SHA-256: da5912a856b36935ff536b3f3a7fbea0ebfd48b077b2ed7b0514f823f9701cec
font_01_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 19976 bytes
SHA-256: 57f6b7fbcf475f808f1dca215ec635ede7d6839c13aab4ead8876879c85dec9e

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