Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae639bb90b73d9d0…

MALICIOUS

PDF

73.5 KB Created: 2021-04-06 03:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cc381b3c9a5c4e5444afef2edce942e8 SHA-1: d69a62cb7c2a82f1c0f5ea9781ecd15190655139 SHA-256: ae639bb90b73d9d0de495927c243f0c35d49b97dd797a18a395a825764e16d00
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and disguised as downloadable files, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://leonvi.ru/123?utm_term=coliforms+in+water PDF link annotation
    • http://redirunna.xyz/download_winning_eleven_2020_for_ppsspp_androidoxgbt.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/93334235727.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/jNNnGTC/65337126861.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/ig7ZZJj/8568086869.pdfIn PDF document text
    • http://nowtorrentz.com/618698689463mbe3.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/47033993382vqum8.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/4711334.pdfIn PDF document text
    • http://dronextactical.xyz/70521158082kmmk6.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/ifAjhVx/22258385438.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/4364461.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/ibjfIre/22888619235.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/area_and_perimeter_of_compound_shapes_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/tibhbSe/15920744152.pdfIn PDF document text
    • https://ravuluzezufex.weebly.com/uploads/1/3/5/9/135956854/9372624.pdfIn PDF document text
    • http://sizerasadaxer.mywebcommunity.org/zosadutoz.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/tabutapupi.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/all_formulas_of_maths_class_10_ncert.pdfIn PDF document text
    • http://rentline.pro/54281319003qlhtt.pdfIn PDF document text
    • http://biotringel.shop/wanasalikmkz8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_90b133d686164c22b69003539106feb2.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_296d37b57f874250af3977e7fe460bea.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_3b5a4c855f8a4c3b92962b288de187f0.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 4912 bytes
SHA-256: 42b957922db44cb425d2b0948c8900f8a3cf00c82edd5475917520c536527391
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10324 bytes
SHA-256: ba2cf4c60983866b922e30dda1b1aa619fe04947b4123686e979359d7bffd0d2

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