Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0fe76e370fd2f6…

MALICIOUS

PDF

79.7 KB Created: 2021-03-26 11:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8649aabcf87c5bcfcad0d14e8ff187f1 SHA-1: 73517171ae0b85e33a46be45c9b89783c1ee5080 SHA-256: db0fe76e370fd2f64b98b8fb0fa11075da9c5cc2f965c609c10ba5cc1055f0f8
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various external PDF files, masquerading as search results. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly indicate a phishing or malicious redirection attempt. Although no scripts were extracted, the PDF structure and the nature of the embedded links suggest an attempt to lead users to potentially malicious content, likely for phishing or malware distribution.

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://druttle.ru/123?utm_term=sundara+kanda+ramayana+telugu+pdf
    • https://pusigigapuguv.weebly.com/uploads/1/3/1/4/131438477/jijepidoz.pdf
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/tiworijaz.pdf
    • http://rasudilikid.mywebcommunity.org/mawusugorisugowi.pdf
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/8cc35d.pdf
    • https://fumasidabufip.weebly.com/uploads/1/3/0/7/130775820/e3730c.pdf
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fc8dd954c714.pdf
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/wewoluluj-fegegupedimi-lipidosi.pdf
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6037eee07a2ea.pdf
    • https://cdn-cms.f-static.net/uploads/4409425/normal_5fd8aef80682a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/7ee03cc3-9ff5-4b9a-9c5e-6427c5824ade/end_of_the_world_song_jojo.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_be2098231e9d4efeb9ddc615322db638.pdf?index=true
    • http://sajetubaj.epizy.com/zivofakotexeso.pdf
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_95ad888276424bae96b871604e5c8b36.pdf?index=true
    • http://binuxusegewake.epizy.com/30965901687.pdf
    • https://uploads.strikinglycdn.com/files/2188401d-f896-415f-a402-a78e9f589532/26957966420.pdf
    • http://vikajedixased.rf.gd/48532703502.pdf
    • http://bexudogi.rf.gd/zagikiguvinejebaje.pdf
    • http://nojikigor.myartsonline.com/7366906975.pdf
    • http://gavexebalaji.rf.gd/dunifutuwuvebosala.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8c.bin
3ddae973b0bc775d951c15787ee9961709136249ffa8394b74af5fbfc0c40c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 5452 bytes
font_01_sfnt_off0000fd17.bin
31b1dbb7fb56ce2a7274c5b3fe1b334820333c5c0e25228d3d152e3184dc045b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 12180 bytes
font_02_sfnt_off000123d4.bin
42e2d755b5abc1ab89ebf741acf1cc20227dc585753fbc80bc9fa70a9126a57e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 3300 bytes

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