Malicious PDF — malware analysis report

Static analysis result for SHA-256 b490411d25cf7da6…

MALICIOUS

PDF

78.7 KB Created: 2021-05-20 21:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5f0a1f8579a6bae9fb8435b76cc1a0ca SHA-1: d1a8f8d4ce2d9ab39aa3e92a9d2af29c1e88300e SHA-256: b490411d25cf7da600ad5ed7fec596ec9d34f209bb4ea4e8185eeeab9fa85ab6
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The presence of a URL with a 'utm_term' parameter indicates an attempt to track user interactions, likely leading to malicious content or further phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=troy+bilt+2800+psi+pressure+washer+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383802/normal_604b8f85ea621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419820/normal_603890835676a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_602620e19fe0e.pdfIn PDF document text
    • https://gidaletibom.weebly.com/uploads/1/3/4/8/134881461/kubejodurarit_depamokowolut_vozokux_xakanilikaf.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/75e966bd21ea739.pdfIn PDF document text
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/pemonejafeze.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/labupij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_6054229cb8ded.pdfIn PDF document text
    • https://fetozoweriwoj.weebly.com/uploads/1/3/4/6/134631739/5651156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_6066672b5394e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7009d71e-ba64-47e7-ba25-67a8c61f9ff8/vojijuzamab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7807a5-0b4f-46c1-96cc-d83ada4be694/dixapolafefuk.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/childrens_day_drama_script_in_tamil_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb74b7f9-69dc-4b6c-923a-1756c7135100/intimate_apparel_shop_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a56a51-bb79-427d-a521-a7a891a4be8f/napupav.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/wonatovumoxipusiduxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3109ffa4-b489-4153-a728-eff09d594548/84486713696.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/prelims_2019_answer_key_upsc.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/troy_bilt_rototiller_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/19904775974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a75371-767e-427d-af06-c7733356f70f/how_to_draw_cute_stuff_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/queen_s_guard_uniform_history.pdfIn 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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 5808 bytes
SHA-256: bb5ef436344ff4ed7e91fc4f3ee3c5a0fa8c519526d5fb5345e311ec0a1bd114
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 11044 bytes
SHA-256: efd0f0cb79740fd21e57348f8ef0439bcd97793d97851f14e19aac300dc67c46