Malicious PDF — malware analysis report

Static analysis result for SHA-256 5984048d9e3d6189…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 19:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86022172c32b7463b4c696618afe92cb SHA-1: b8d90add3fc7e9cbd6dc95a7b035c0fb4619562e SHA-256: 5984048d9e3d6189b0aa2b774900516706a17af9d69e56435fb9e1c6768dd6da
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing, and is flagged by ClamAV as a phishing trojan. The primary malicious URL, https://dafemum.ru/strik, is likely used to redirect users to malicious content or download further payloads. The document body, though heavily obfuscated, suggests a lure related to a printer manual, aligning with the phishing and link farm heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=canon+mp11dx+owners+manual
    • https://static.s123-cdn-static.com/uploads/4490376/normal_5ffe91c5bd6a2.pdf
    • https://cdn-cms.f-static.net/uploads/4370543/normal_6028f47cc6ab1.pdf
    • https://cdn-cms.f-static.net/uploads/4379485/normal_601731d4f3fae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/migivewuwe/40532353899.pdf
    • https://s3.amazonaws.com/tobobowu/5150396894.pdf
    • https://s3.amazonaws.com/zuwosil/android_studio_fragmentcompat.pdf
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_5bb553b94c4744ff9428fbb4d51dca1a.pdf?index=true
    • https://s3.amazonaws.com/jumedemimo/banuso_by_brymo.pdf
    • https://s3.amazonaws.com/tokatefozude/48982268817.pdf
    • https://s3.amazonaws.com/wozoxub/lazebigumejuzizagazojek.pdf
    • https://s3.amazonaws.com/xufujofaleki/how_to_pronounce_the_name_ivanna.pdf
    • https://s3.amazonaws.com/xubifupi/77780353221.pdf
    • https://s3.amazonaws.com/radubozufiwo/75587365263.pdf
    • https://s3.amazonaws.com/zabejuvijolu/blastocyst_formation_in_human.pdf
    • https://s3.amazonaws.com/medaliwifufugel/hire_purchase_agreement_sample_template.pdf
    • https://s3.amazonaws.com/vunizi/35067770073.pdf
    • https://s3.amazonaws.com/pisedij/22988752031.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/4973327031.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_3702acae5f4b4ae192c82ac04188fd70.pdf?index=true
    • https://s3.amazonaws.com/zowibatev/samafoweguwivatu.pdf
    • https://s3.amazonaws.com/divexikav/nedinoda.pdf
    • https://s3.amazonaws.com/jonora/80291677272.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_off0000df15.bin
f854d1a8a88f388b95ebc11bc244467eb721a5beb2cc9f190661061c3e823adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5092 bytes
font_01_sfnt_off0000f05d.bin
b4225537e7275530b34b31e66dbf7b5db75715b8014eeef7e218f288ce27d393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 10416 bytes
font_02_sfnt_off000113f7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 4324 bytes

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