Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9baba333a32a5a…

MALICIOUS

PDF

89.8 KB Created: 2021-03-20 01:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2ac40b9fb0d2e780e7469c5ac3e8e25 SHA-1: 2f510f551b627ae61d2885321b14e7c22104d68c SHA-256: ef9baba333a32a5a562182a41563bd24d3fddff8c4bae3ccbea77795eeecf8a3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to a "PDF_SEO_LINK_FARM" and "PDF_URI" which suggests the document's primary purpose is to host a large number of external links, likely for SEO manipulation or to direct users to phishing or malware distribution sites. The embedded URLs, such as "https://kuzutuzo.ru/strik?utm_term=lord+of+the+flies+movie+actors", are key indicators of this malicious activity.

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://kuzutuzo.ru/strik?utm_term=lord+of+the+flies+movie+actors
    • https://cdn.sqhk.co/marelagixe/RibIjfe/59518722821.pdf
    • https://cdn.sqhk.co/fusajovogi/wgeLtKy/steam_workshop_downloader_free.pdf
    • https://cdn.sqhk.co/xivudebisov/giarjeQ/2017.pdf
    • https://cdn.sqhk.co/ratufewebu/x9jb1gd/5629162752.pdf
    • https://cdn.sqhk.co/bapuwanuvadi/hdifihW/selawovegerifak.pdf
    • https://cdn.sqhk.co/noneniwetav/kE9jjgs/35180472569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_3122289e75b141d7b2832797cf2c7328.pdf?index=true
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_41309533794540a6a975b1164964e13f.pdf?index=true
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_06a283637c2a445b9438973e0f2831cf.pdf?index=true
    • http://biwodonugawodil.rf.gd/campaign_rollout_plan_template.pdf
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_1a94e93032bd40228f7b955b36fd32d9.pdf?index=true
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_fb1bb6d5a92c47c6ab3d6b76e0158d07.pdf?index=true
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_b289c2cbf93c41feb40092a077e3317e.pdf?index=true
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_56b452f7d9cc40a2be55d8556e30c75e.pdf?index=true
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_6578db5da763447faa2e6fab173d8cf5.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_efc3a1d74de14544bb14e17b86d7844f.pdf?index=true
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_9f9237abfe3744b8b31b19f96cacbb77.pdf?index=true
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_c300f0e440a644d9891d81124e3e8c1e.pdf?index=true
    • http://joluvolob.epizy.com/32045470447.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_off00011b74.bin
0fed83bf251b91f758043bc51b0cfd6bd753d65722808c62cb52bc042124e39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 5264 bytes
font_01_sfnt_off00012d38.bin
d2f40c7fbea26a410d3fb39c380b576535ef882b843af3b99d6e93c1b984723c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D38 13944 bytes

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