Malicious PDF — malware analysis report

Static analysis result for SHA-256 1075d6bf6f1f6c2b…

MALICIOUS

PDF

88.8 KB Created: 2021-05-02 11:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86c81d1c05d9b6868e7549f862231a81 SHA-1: 3e05b4a59a492921130b17cf69f38c950e6bf756 SHA-256: 1075d6bf6f1f6c2baa3dc1586c579b1e7512c8cd63cc64cf4c9b597aa5e2a23c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=watsons+go+to+birmingham
    • http://twitter-center.com/23146390551ebdfn.pdf
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5ff7170390107.pdf
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fe7c816265c3.pdf
    • http://fitixezuveseli.22web.org/44871815194.pdf
    • http://wagagawoduzom.iblogger.org/todolo.pdf
    • http://dutarotanazosuv.medianewsonline.com/how_to_chop_samples_in_garageband_ios.pdf
    • https://cdn-cms.f-static.net/uploads/4444374/normal_602199476a34e.pdf
    • http://dorightpress.com/3342038246f9wlf.pdf
    • http://rusadezebep.mygamesonline.org/73051364165.pdf
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60318ffda472b.pdf
    • http://damita.fun/chocolate_pound_cake_recipes_using_cake_mixp35ed.pdf
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/jeberosam-jebanowob.pdf
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/80c4bdf.pdf
    • https://cdn-cms.f-static.net/uploads/4446494/normal_606e47c8df049.pdf
    • https://begopafisofebe.weebly.com/uploads/1/3/3/9/133997970/8340918.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lipaxunuvevi.epizy.com/the_big_easy_oil-less_turkey_fryer_parts.pdf
    • http://wobadumiravolu.atwebpages.com/bavaleraripofe.pdf
    • http://lufiwivumijej.myartsonline.com/52069730018.pdf
    • http://zeroxezubanalil.onlinewebshop.net/orthographic_projection_to_isometric_drawing.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_off00011f01.bin
cd36a69f99eb9f76e49aae08c152d4d0da8dce87358ac8e8270ae475ecdb225b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 5220 bytes
font_01_sfnt_off000130a7.bin
e7eb54c6227efadd64261e81352d1e4759b6b3d27a815937ade5f797e5ee589f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 10484 bytes

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