Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0d481c376a719b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-22 11:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 004f2f095c51064e5117467dd7001240 SHA-1: 9a3c7faf0ea405f2ca61bfaf49b8435b84492da4 SHA-256: ef0d481c376a719b912426ad8f0c23974c1b3c27e7cc1c844a3c253896bc0add
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for SEO link farms and phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=jurnal+bacillus+thuringiensis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485589/normal_600e613b35073.pdfIn PDF document text
    • https://zorovapi.weebly.com/uploads/1/3/2/3/132303286/c25853ad82d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_6016cfd46f126.pdfIn PDF document text
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/kuxorakawefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495042/normal_60564856beacf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6011b029b1997.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/haMugfL/funny_ringtone_for_boyfriend_download_mr_jatt.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/cdLX8he/mupopofaneladolujumeworit.pdfIn PDF document text
    • https://midigoxu.weebly.com/uploads/1/3/4/0/134000126/gexozuvalujate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_d2e1830cd7a14f1baca4f97a93bd4221.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_8489754825df4e659dd984a985858ffd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15eb3102-44c1-4069-9626-e83b9f2e4d0c/the_alienist_season_1_episode_4_cast.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_2917e8a1c360402b9bc3218524ad29c1.pdf?index=trueIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_ece329ef71024b0894805be962ebacd3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de16399-eddf-45e7-9acc-efe121bb4bdb/sosubevetotesajovozavoz.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_47e02b73bd824592bc74d10732bdb12a.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_d59c0774dcb843768a66dc8adbbaecc4.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_1fe0a43ed6254ba1a65abc7e302e2970.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_5552b71df0504165981864e9c24fc8c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9aa045-169a-4f0d-9e8f-b27eac2a8200/43341682719.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_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 5544 bytes
SHA-256: 5a96b5a59925a93a009811d0a021be54d97ede4a786230ee3544609c79c1cbcc
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 11832 bytes
SHA-256: 3663b6defaef3c0353199176ec94e0168944b09b0b55b2d7976c00ea4bc1ef6f