Malicious PDF — malware analysis report

Static analysis result for SHA-256 1772d21e3fd35b90…

MALICIOUS

PDF

76.6 KB Created: 2021-04-22 03:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d83aca625e0977ed2321b5914f3923de SHA-1: 4da3515992e5315a9fe40fe124be1a6035bfac46 SHA-256: 1772d21e3fd35b90edfecc1a0d2db9491313965d4a89e01444bc4b21edfa355a
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external links, many hosted on disposable domains, suggesting a phishing or redirection scheme. One prominent URL, 'https://dugedepap.ru/strik?utm_term=dsc+alarm+add+user+code', appears to be the primary lure, disguised by the document title 'Dsc alarm add user code'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://dugedepap.ru/strik?utm_term=dsc+alarm+add+user+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373779/normal_606a8aa59098a.pdfIn PDF document text
    • http://hihikane.space/dok_levels_chart_mathip64y.pdfIn PDF document text
    • http://xorelurisadadun.iblogger.org/60969515186.pdfIn PDF document text
    • http://podarokinsta24.online/who_is_iceberg_slim_nigerian_rapper348jt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_60315b0d61106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_6013a6dd5623b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5fccb7a207267.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/manual_casio_g-shock_gw-7900b-1ervalsa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_064b1688b0b94b5498d9400cdb92e196.pdf?index=trueIn PDF document text
    • http://nezenomawaza.epizy.com/rojekudolutibofevutaner.pdfIn PDF document text
    • http://kubitilabevovup.rf.gd/97257220139.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_760b4243fdf140c389c9f94dc7a02847.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_fa36426533d74685a2542e4c574c7fa0.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_f5bd3966f9034eb3bef093fd58faff55.pdf?index=trueIn PDF document text
    • http://xanojeja.rf.gd/xuror.pdfIn PDF document text
    • http://napalujimawoz.rf.gd/69817036490.pdfIn PDF document text
    • https://8bee2916-85bb-4632-b494-424615dbadd5.filesusr.com/ugd/cacfd7_3cd61f6a12c04908b393ba8d780e08cd.pdf?index=trueIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_958a3f1cb2ad43e4ac663a251a1993a6.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_cc964ec076784e05a516d33bf0d9ede8.pdf?index=trueIn PDF document text
    • http://fogiwomagivizu.rf.gd/99633976190.pdfIn PDF document text
    • http://delezomixotu.epizy.com/saxamifixoxudazavuxab.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_3dbe5565a9fb4e919a04ad48320b5083.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 4732 bytes
SHA-256: 58d88ee68aee38a1210c3286b35620aa9e61efdd744c14b604c3cb9e3816c975
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 11324 bytes
SHA-256: ab2ba68861c402b395d456561ab9cf55eabe1334ce5aaff6b14bddfc5b0ef55a
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3