Malicious PDF — malware analysis report

Static analysis result for SHA-256 1285fd23f0ec6a0e…

MALICIOUS

PDF

87.5 KB Created: 2021-06-02 06:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 503e52ac36dade5335419405b3e93a92 SHA-1: 2342c93250f3c42d7184ed5d072224aa42e5026e SHA-256: 1285fd23f0ec6a0e4a10f583e586cd81be6fe25e0ffebb9e900e03ac211214a3
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/pbw?utm_term=free+download+mp3+koes+plus+kembali+ke+jakarta PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426960/normal_5ffdf1a0ba46a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_6034c16e0862b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_60657285e37c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fc827356c1aa.pdfIn PDF document text
    • https://namovanuzo.weebly.com/uploads/1/3/1/6/131606642/e1a5c09922c0b.pdfIn PDF document text
    • https://fugowekarulosom.weebly.com/uploads/1/3/4/7/134700114/vimeli-malafuga-tizeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojirakaj.pbworks.com/w/file/fetch/144424923/62679468198.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144442473/ketekerutesuzap.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144483795/doruzunevobegubun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629d6c6c-870e-4882-be08-edd3d464b2b2/what_to_look_for_when_buying_a_new_construction_house.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144422325/collapse_of_the_malolos_republic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d42315-31dd-4aa4-9947-b31703e61a23/how_to_make_glider_rocker_cushions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c778dc-0c1f-428b-bce2-9d3d0a1e5c63/yo_amo_a_paquita_gallego_capitulo_138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9258d277-3cc6-49d5-a321-eba8730fa6e9/laxesepomisipet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1034b555-be58-4673-95a9-ffd611d49af7/does_consequence_have_a_negative_connotation.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144491916/mcq_on_algae_and_fungi.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/nolanaj.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_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 5596 bytes
SHA-256: f15cfa00cea708120d0b6642ac99c10df1d939938b3061ff5fad3dfd334f8de3
font_01_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 11516 bytes
SHA-256: c5cabaaf80ced8f7bae12a76f0e39c8ff01093e673d863df6a285632b97b90c0