Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb0aa8a4284b4c6…

MALICIOUS

PDF

101.9 KB Created: 2021-04-01 02:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1bb6e8ca4b44e5bbb3ddc3d21cbb497 SHA-1: 2f0c4afd88dfa87d26ff5e97a564f32719840351 SHA-256: cbb0aa8a4284b4c69aa88447f409d20021803f46d56ca956482e0b7b68d42e92
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata that aligns with the PDF structure and potential lure content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=bajirao+mastani+song++pk
    • https://cdn.sqhk.co/dikizumi/jaiargi/doll_house_cake_cooking_games.pdf
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/6db6af2.pdf
    • https://cdn.sqhk.co/wiwokosokif/gjqMh7l/xidexolo.pdf
    • https://cdn.sqhk.co/sokaxopoje/iJeP6nB/switzerland_time_zone_abbreviation.pdf
    • https://gonelato.weebly.com/uploads/1/3/6/0/136082396/4372317.pdf
    • https://suxexekara.weebly.com/uploads/1/3/4/6/134635419/vuxaresop.pdf
    • https://cdn.sqhk.co/dilobowuz/fheM3gi/35397810430.pdf
    • https://cdn.sqhk.co/pefisemise/ohdibu4/67803403499.pdf
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/rodapeti.pdf
    • https://cdn.sqhk.co/xuwifoviwalo/E9jjdji/melitamogawolaveg.pdf
    • https://cdn.sqhk.co/dabozijide/aQeUifD/pegawokafamuzemixon.pdf
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/3646418.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_2ba61c55db74438ebf6cdd2a7f8abc1c.pdf?index=true
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_98aa58425d9941a589252ec03a32a571.pdf?index=true
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_7fda850a678f4ca4abe23e11c4d30dd6.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_1cb0f195229143889aa8762adef0e9de.pdf?index=true
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_cf60888836aa464f829942bf4174dde8.pdf?index=true
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_068c84d6f489484eb22aa49ae89aa334.pdf?index=true
    • 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_off0001536d.bin
1f48f257759d60f3321bf799ac99154986b8eab289e7edf595b07522459b9820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1536D 5296 bytes
font_01_sfnt_off00016567.bin
f4e3e7a82cab65b4466e6f7e6f50e01af29cc20460d3f5793d59b1ccade0a7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16567 10948 bytes

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