Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffb7c5898e0025b…

MALICIOUS

PDF

80.9 KB Created: 2021-02-28 09:15:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2a50c2afb34326bbb6e7cbf8030222a6 SHA-1: 31ed2ea3530aadd84e8a30c2146f151a5afc5cb0 SHA-256: cffb7c5898e0025bd63d21098b62a26834ee2d52501b5e487c9cdfc3f4191ddf
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to drive traffic or potentially host malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used in phishing and SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=difference+between+static+and+dynamic+web+pages+with+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5fd9c8d43966f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5fc855e81d32e.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/how_to_make_someone_fall_in_love_with_you_farouk_radwan_download.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/munisabezon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_601be669e7210.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/how_to_set_butterball_turkey_fryer.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hgeRkhf/hoverboard_walmart_in_store_near_me.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/gobave_rolafijed_pukap_mamotamonusezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_603b14314ef96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486221/normal_60278f50da399.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/9hfO5gh/71666465116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5ff797b430d76.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/iBjRgdh/jumpy_jumpy_helix_ball_game_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5fd0fdd70edd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_603ac8637c9c3.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/g3Lhfqg/modern_retro_attire_for_ladies.pdfIn PDF document text
    • https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/1470445.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/la_divina_comedia_quien_fue_el_autor.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
    • http://balubusepebibi.rf.gd/where_to_buy_a_kit_home.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 5648 bytes
SHA-256: c76a40460edad3acfcc2349a6e86fe13a0a31c933d8b76355e1808130924efd4
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 9936 bytes
SHA-256: 60d934bdc4d43a05e55f575985d6daeb816fe8143cd34a12253ce3e6d5ced674
font_02_sfnt_off0001274e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c