Malicious PDF — malware analysis report

Static analysis result for SHA-256 137dde33904654d2…

MALICIOUS

PDF

77.9 KB Created: 2021-06-05 10:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8897590d790b2033b5df285bdacba4da SHA-1: 8e5cb985ad5d76853b68b3bd8cd0860366ef29bf SHA-256: 137dde33904654d2649075294101b4754bacb7c771b19be716a0d94bd21b1f60
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious. It contains a large number of external links, indicating a potential link farm or phishing attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://cdn-cms.f-static.net/uploads/4415951/normal_602a46f8108d9.pdf
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/1994993.pdf
    • https://cdn-cms.f-static.net/uploads/4427529/normal_603138b8cccbd.pdf
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/5096207decd.pdf
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fe0fc00cb236.pdf
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601a33e8cafbd.pdf
    • https://cdn-cms.f-static.net/uploads/4381105/normal_601245dd6fa14.pdf
    • https://doxagazezuzizum.weebly.com/uploads/1/3/1/6/131606815/putumofasemejatam.pdf
    • https://cdn-cms.f-static.net/uploads/4479923/normal_602e671d128aa.pdf
    • https://static.s123-cdn-static.com/uploads/4371246/normal_60001890cc370.pdf
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/nevegubufoguwi.pdf
    • https://cdn-cms.f-static.net/uploads/4393776/normal_601f88d7436ea.pdf
    • https://static.s123-cdn-static.com/uploads/4456667/normal_60031f88c9056.pdf
    • https://cdn-cms.f-static.net/uploads/4421629/normal_60308298ddbda.pdf
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/dotagunowe-fifojazimewig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=the%20tempest%20summary%20act%201%20scene%202
    • http://kafunujazuwo.pbworks.com/w/file/fetch/144577836/how_to_make_a_sponge_in_minecraft_1.15.2.pdf
    • http://xorunezagu.pbworks.com/f/96345888653.pdf
    • http://xuvabufoj.pbworks.com/w/file/fetch/144564555/army_battle_simulator_mod_apk_home.pdf
    • http://ririgifavem.pbworks.com/f/17549931428.pdf
    • http://feteselulo.pbworks.com/f/tobujesijozorusomem.pdf
    • http://ronefete.pbworks.com/f/como_desligar_tablet_samsung_travado.pdf
    • http://ludagobef.pbworks.com/f/zivil.pdf
    • http://tugewuvog.pbworks.com/w/file/fetch/144618345/farotaxomefuxadetolajafa.pdf
    • http://fixiguru.pbworks.com/w/file/fetch/144456447/67961442205.pdf
    • http://gazumadu.pbworks.com/f/nils_frahm_sheet_music.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_off0000f419.bin
ec03dadd5c6f0fef599f52b0d101ecee90fbd527320f8dd624c8dcfadb753a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 5376 bytes
font_01_sfnt_off00010643.bin
284ada11982212d130e87a320a4d651766f22186455daaa730d7d36b21c44b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 10428 bytes

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