Malicious PDF — malware analysis report

Static analysis result for SHA-256 092a8783cd33bf9f…

MALICIOUS

PDF

77.0 KB Created: 2021-04-13 13:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d3ffc223bb467400b7eae4bbddec4c0c SHA-1: 23d1df96fe169a4c1813a6e38a8825a99ddee289 SHA-256: 092a8783cd33bf9ff00cd1568ceab4c74a984af31f8dbc4217f80398db2bc620
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it is designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=the+bfg+1989 PDF link annotation
    • https://cdn.sqhk.co/pometobab/igBWE5s/electronic_project_kits_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/hfyt8hd/62109644728.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/ghZiiRm/exorcist_3_trailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_5ff39171e1ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6013ea5077c26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_5ffdd30940418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_60096201bebbd.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/hdicXiZ/download_game_fire_gun_brick_breaker_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_601b7e67a66d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fd6524d2ed10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_75b0bcf8841948cdb0d8b162f9d23bf9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/canon_imagerunner_2520_scanner_software.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_54bce98ed87a4628a4c732f405ecdb21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/what_do_the_chinese_symbol_emojis_mean_on_iphone.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_6bdea51a37d04178bf45f820aed3f17e.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_d87927a0849b443296533b795b899903.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_24545975388b4e22a59500e33ecf88e5.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_648916092e3e4fed8cc3b73856856252.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_759dc4271b9f4666b00837fc4f62b101.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_24cc34b7cfdd4626aa25fc225bf96ed4.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_75259eee530148a28e3d884f341d3e7f.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_d6af6dfdfb424ec0916781a465a61448.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 5004 bytes
SHA-256: 4d49e7bd164cb3d2271cf6feefba6712a9d4f3b78773be45be2b3763cd7a7582
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10532 bytes
SHA-256: 8d52c67ba52d4afa10b580b07dfb8962c197f5389293b339c8f3fb546a0565a1