Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabc9c607f23b9f1…

MALICIOUS

PDF

75.2 KB Created: 2021-05-03 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 067e07d531b68ec5e63a14369ffcf855 SHA-1: d15474fb66928dd6f7411d113d4bfab70d6dfdd3 SHA-256: cabc9c607f23b9f102e0f4f33de80829c8032ca012154bebec5980d6910c5ad5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with a primary suspicious URL pointing to 'maypoin.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'dictionary phonetic alphabet translator', which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=dictionary+phonetic+alphabet+translator
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fed0cce63438.pdf
    • http://netlysy.online/how_to_write_a_fiction_story_step_by_stepo7edz.pdf
    • https://cdn-cms.f-static.net/uploads/4458824/normal_6056e7fd10e29.pdf
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fe10b25a9baf.pdf
    • https://cdn-cms.f-static.net/uploads/4416332/normal_602be4865bd8d.pdf
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5ff98d16c8ffb.pdf
    • https://cdn-cms.f-static.net/uploads/4491925/normal_606c4300783d6.pdf
    • https://cdn-cms.f-static.net/uploads/4419424/normal_600e4ae5de2be.pdf
    • https://cdn-cms.f-static.net/uploads/4389355/normal_600da06e59cef.pdf
    • http://greyfruit.space/colligative_properties_of_solution_worksheethg3t5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_4e40900d4c3e406784fd43e3d579cd65.pdf?index=true
    • https://s3.amazonaws.com/lulelepese/41720462481.pdf
    • https://s3.amazonaws.com/paxuvagal/mokisokepukawezojolis.pdf
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_cc544b6eb931408fbcbb61cc1098cd10.pdf?index=true
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_1c81bc550a07492dad5c44ead0418570.pdf?index=true
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_0d4a04f2a3464568bb91692dc623821c.pdf?index=true
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_8fa653572db5406f905da25621d7f4ac.pdf?index=true
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_b9bd8492b07c40b69da2a8cf697add65.pdf?index=true
    • https://s3.amazonaws.com/sorapobuk/hydraulic_actuators.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_off0000e596.bin
ce135f681eb0969e67ee72fc8d89240d8c432201b7e5b67abbc2ce0836952f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 5260 bytes
font_01_sfnt_off0000f77c.bin
22cdba958dc0001dc379d8ab681ec96d12d293a6b05da697827b9405239f9893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 11948 bytes

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