Malicious PDF — malware analysis report

Static analysis result for SHA-256 90803530ef0ce7d9…

MALICIOUS

PDF

70.3 KB Created: 2021-03-29 18:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dcfd204382a62b336ddb1070cfb6d55 SHA-1: 1702e924523294da183badb75047789d4ac53de5 SHA-256: 90803530ef0ce7d9a6666c595cfbe2829c828bddf5377c052db20f4f61abb0c9
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 or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://xajibur.ru/award?keyword=attestation+de+cession+de+terrain+pdf
    • https://vimijalubatek.weebly.com/uploads/1/3/4/7/134739875/55c05888ff1.pdf
    • https://cdn.sqhk.co/kogeledewafo/jbb7kTX/pets_crossy_road_secret_characters.pdf
    • http://bepelisufozasep.mywebcommunity.org/apostrophes_for_contraction_worksheet.pdf
    • https://cdn.sqhk.co/kibutonap/5rlPhdA/2774669780.pdf
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/41aa1294.pdf
    • http://tanubujurutemut.scienceontheweb.net/94512251276.pdf
    • https://dazifonawifebi.weebly.com/uploads/1/3/4/7/134763946/sapakowil-gapoti.pdf
    • https://wemubutuve.weebly.com/uploads/1/3/6/0/136090051/maxoravo.pdf
    • http://kogemotuju.getenjoyment.net/98482884529.pdf
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/e50589c03218037.pdf
    • https://cdn.sqhk.co/molewekane/Ajejjig/97383438950.pdf
    • http://lumogodasekepi.mypressonline.com/72168391870.pdf
    • https://lesavamu.weebly.com/uploads/1/3/5/3/135347369/nodagovov_xemudur.pdf
    • https://cdn.sqhk.co/perolurowona/YOhfQkR/best_80_s_dance_music_videos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zepifudoxapo/biodata_format_for_marriage_for_girl_muslim.pdf
    • https://s3.amazonaws.com/sagotomagin/9656946547.pdf
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_fa9736493a944a35862354a5dd3e594d.pdf?index=true
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_e9e2226f5c2a476f8ceff33c2737d339.pdf?index=true
    • https://s3.amazonaws.com/febopa/50997250705.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d244.bin
e0c27ad0647c848f02a651a55eac57324c4beafbb5cfab1794f1280e0ed2d040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 5104 bytes
font_01_sfnt_off0000e3b5.bin
593a52a0976f1914299399b7d97db9d1be9cca9d856347aec1c747d41538ba6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 11876 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.