Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9a8451122606c8…

MALICIOUS

PDF

94.2 KB Created: 2021-06-05 07:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f636eea663025fc22ce78baa7ab41bb1 SHA-1: 5d5388e0466189bce430f4ee504f476ec0358701 SHA-256: ae9a8451122606c8bceb2eb9d364b2e6c8284f4151718b8ac6229c777990c6f1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/pbw?utm_term=zane+and+the+hurricane+pdf PDF link annotation
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/6730519.pdfIn PDF document text
    • https://bebezirowud.weebly.com/uploads/1/3/4/3/134371107/jaxibipatorasem.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/877902.pdfIn PDF document text
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/2470944.pdfIn PDF document text
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/4515558.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/45881c88e0d5690.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/0a014fce5e461f.pdfIn PDF document text
    • https://gogukosujupubof.weebly.com/uploads/1/3/5/3/135317205/6725511.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/32f0d7db-85c9-4bfb-b991-c53cda4ead92/kokosusalolurinugukalom.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/how_to_write_bank_request_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0cb2df-0f99-46e6-82b7-6dc1f6b563d0/11551015352.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144460164/boom_beach_cheat_iphone.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144643380/what_is_bigger_faster_stronger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33dc1e2f-5e4e-4847-a2eb-ac484fa0f5f1/excel_sum_formula_for_subtraction.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144598821/26686355267.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/w/file/fetch/144552024/mujowuwafatuwezad.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/76675027270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8dbcff-edbd-4546-a039-badc156176ed/who_is_lucifers_father.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f98f2b2-1443-4f12-ad5b-22dc9d609c30/96395489928.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_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 4988 bytes
SHA-256: 287180ba2c7d8dd2feb96980c061df8ee8dd3748f511f814cde8f37bcacc5a6b
font_01_sfnt_off000146fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FB 10816 bytes
SHA-256: ad39621b7c0d9a3c345b23cbcb3af408a812fe374e4d9603114d142d9f5fd388