Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab98d540269e28c…

MALICIOUS

PDF

68.1 KB Created: 2021-04-07 00:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77c50f2cd172284b6b66d06150e6bfb7 SHA-1: 3e7358c0107b7051cf195a30d2ba33989eb69642 SHA-256: aab98d540269e28c06076dd4e45f332d1b85556c97ad66070036a4a52f97ce6e
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8223

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-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
  • 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://pelibifir.ru/award?keyword=mariano+azuela+obras+pdf
    • https://cdn-cms.f-static.net/uploads/4421770/normal_5fd8dd09c3d15.pdf
    • https://cdn-cms.f-static.net/uploads/4459466/normal_60377f0c8619f.pdf
    • https://xogevowizixid.weebly.com/uploads/1/3/0/9/130969953/disizagorumagafe.pdf
    • http://xedeporib.medianewsonline.com/1970_ford_mustang_mach_1_428_cobra_jet_value.pdf
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/dubusunalo_monidexo_gukibafop.pdf
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/xeguferesevosu_susamukikasiji_wunozeloxudosuj.pdf
    • http://paselon.getenjoyment.net/visoxubogusaruxugugeno.pdf
    • http://giwudogor.scienceontheweb.net/35673350484.pdf
    • http://vijevejumozugim.sportsontheweb.net/56599037651.pdf
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/nutunatavokex.pdf
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/d401e449f43d.pdf
    • http://naxuvazexipok.sportsontheweb.net/amelie_notes_piano.pdf
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/3235531.pdf
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/1367551.pdf
    • https://cdn-cms.f-static.net/uploads/4450625/normal_604fe4f96ad4f.pdf
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/35fcd885cd535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_5491a65b713f4e2ba1272151cc7066d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1ef96b98-eb4b-4519-97b2-95b9297e4754/42072826009.pdf
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_a67ab5520a2343428f46f6b6a78355c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3baa952-a18b-4c43-be0a-dc973ec79fa2/3224418108.pdf
    • https://uploads.strikinglycdn.com/files/8ba8d41e-e89c-4b3e-be95-28212de6bebd/ms_word_table_of_contents_levels.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbb.bin
160f6234928f59a305d3325e0d386ef78123a42f4ea04aa7afb5e716f1f522cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5228 bytes

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