Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a731ebd2585ebd…

MALICIOUS

PDF

76.1 KB Created: 2021-06-10 01:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a88cad663266fb1b59cd0ac403a93d12 SHA-1: 675cd89de71f0f95e41f9784ea7523e7046a7b0d SHA-256: c0a731ebd2585ebd5e36ee105c4fb8ec55de6784d16d344a46b824c85b78e912
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 hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

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://crewmak.ru/pbw?utm_term=chapters+latest+mod+apk PDF link annotation
    • https://gupimarozak.weebly.com/uploads/1/3/4/3/134350981/2239747.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/3545190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_5fd7f540026ce.pdfIn PDF document text
    • https://wisefumi.weebly.com/uploads/1/3/4/6/134672277/relubagawevufazam.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/zorarativagenafuz.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/3ccdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_602fffa6d0994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6021fc2a1bf34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452395/normal_5fc7edac6307e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4483856/normal_60b4ca36d1d70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_604cfa3d7c4ca.pdfIn PDF document text
    • https://xilemuje.weebly.com/uploads/1/3/4/2/134265988/nubisudog.pdfIn PDF document text
    • https://morewunopidov.weebly.com/uploads/1/3/4/8/134895133/9133127.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/0c7780fbfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_60c12e28119ab.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/fd9f880c-f886-48d8-929a-cfe69858bd8e/watership_down_hardcover_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58faef9c-f823-4436-89bb-b35eb8a773cb/how_to_write_motivation_letter_for_university_scholarship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798b2f52-b2a8-4af1-a9e1-b80876b15fe6/frontline_commando_d-day_mod_unlimited_glu_coins_v1.3.1_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df295837-342e-49b9-9ae5-b282143b2a4c/bofedigigelopovaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860991c2-9c88-4cae-b8e5-37e1d813893b/wasokadunesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07311aff-fec7-4874-b8a0-b3f20b080e46/mowideredisasi.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_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 5168 bytes
SHA-256: aa2f3fd9074c97edf0c7ba122d1daa7baa0014f5f2fe0466150fa55b2f5b1b35
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 11272 bytes
SHA-256: 4cb58858e243eb530eb532a65b4b6f298a959b48c1f037e4aaf31b6d415d9629