Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b0feaf9c095f60…

MALICIOUS

PDF

124.1 KB Created: 2021-03-18 06:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14bb9f43ab0cb4514e1342cd05402a66 SHA-1: 8c3417af9cdf524f33b51e89191508f53506431c SHA-256: 84b0feaf9c095f60bfbd1c53a05d76fc2ba5d65b533e5fc59ff919227544212f
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 hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=bongo+dj+mix+free
    • https://folumenudi.weebly.com/uploads/1/3/2/6/132681426/8800551.pdf
    • http://saxobupazes.sportsontheweb.net/pukes.pdf
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/2946658.pdf
    • https://bebejumupetokox.weebly.com/uploads/1/3/4/5/134513190/7127509.pdf
    • http://sumapewub.getenjoyment.net/associated_press_stylebook_and_libel_manual.pdf
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/xexasorawa_zifapes_xibusuxelutuf.pdf
    • https://zomuwobab.weebly.com/uploads/1/3/0/8/130873958/23a0552.pdf
    • https://xisulufi.weebly.com/uploads/1/3/4/8/134870666/jumawa.pdf
    • https://xitodilizunew.weebly.com/uploads/1/3/4/1/134108755/8730681.pdf
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/3b765ee34.pdf
    • http://potuduwatolebu.mywebcommunity.org/dowazunorofe.pdf
    • http://sekelenogake.getenjoyment.net/21637182389.pdf
    • http://zuxekagapefe.mygamesonline.org/zedenawir.pdf
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/a7c21d.pdf
    • http://namafafiteg.mypressonline.com/activities_for_toddlers_shapes_and_colors.pdf
    • http://kafofal.mygamesonline.org/jawbone_up3_app_store.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivuxo/antibiotic_guidelines_for_sinusitis.pdf
    • http://misanedajog.myartsonline.com/conceptual_synthesis_in_community_ecology.pdf
    • http://pebomotixot.myartsonline.com/miss_peregrine_home_for_peculiar_movie_stream_online.pdf
    • https://s3.amazonaws.com/zazelujeju/jerefegikudokaxarulimolu.pdf
    • http://mifojizu.myartsonline.com/boxukuzaj.pdf
    • http://zesafemumibow.myartsonline.com/old_man_and_the_sea_sparknotes.pdf
    • https://s3.amazonaws.com/buponuwebi/batapuxemimuburav.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_off0001ab2b.bin
342ced1282aba0c0a3ab34c44d32b7884dd5ed22807926bd3df8155d1ff3c16d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB2B 5000 bytes
font_01_sfnt_off0001bc2a.bin
2920c56086cb23a87a71cd80f299d4b36a504149be80c96ed2a37ae277c183c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC2A 11240 bytes

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