Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a2690dfd332c48…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 09:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e032ec6c73fc91eca4366072d7040009 SHA-1: c0fd9a132d4dccfb8b5b871098faaf458864c8e6 SHA-256: b8a2690dfd332c481d45e0e9bc52d144620dd372242b46d7ce74b33ea31882d7
206 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=how+to+clean+cuckoo+clock+movement PDF link annotation
    • http://igbusinessabouthelp.com/86331304971zprp1.pdfIn PDF document text
    • https://xamilugalaw.weebly.com/uploads/1/3/5/3/135325617/zugebip.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/vewupewipu.pdfIn PDF document text
    • http://diganez.iblogger.org/baldur_s_gate_ii_android_free.pdfIn PDF document text
    • http://begdas.fun/the_little_prince_summary_chapter_1-483ac2.pdfIn PDF document text
    • https://patinijogu.weebly.com/uploads/1/3/4/8/134854147/gefol-xofunufex-videvuzu.pdfIn PDF document text
    • http://shopyou.online/what_is_the_ratio_of_m25_concretey7tw4.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/gfheWje/bhojpuri_gana_video_new_2019.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/zokosozezirajuk.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/dragon_d2_goggle_replacement_lensss65g.pdfIn PDF document text
    • http://student-yurist.ru/252755395072hmj1.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/nZu81Yc/42504762856.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/hvjeOha/sorubu.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/cAjfjjH/global_sim_card_top_up.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/38fe5391-d285-4a2d-ac8d-f3c39ebe9a89/qsc_rmx_1450_owners_manual.pdfIn PDF document text
    • http://fisowafoz.epizy.com/76773719849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053d85dd-0d41-4f58-bf75-d0de664ef6ef/lowrance_elite-5_dsi_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43104804-280d-4549-8d09-022bdaa8d3e4/74797217303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de41a02-eeee-4b23-aa72-142b3192ff66/2579802500.pdfIn PDF document text
    • http://siparedobapu.rf.gd/30392871443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248214f1-4fd4-4702-ae5b-bb63b7f36793/xiwumano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee8b178-0c12-438c-969c-378e19bf2b88/vince_gironda_maximum_definition_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718b3e49-2936-4c34-96bb-450f6d6ff000/xapefoninupa.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_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 4848 bytes
SHA-256: f3d3ae83c38a8218a3462cc574c098f4ad162129792ce93773a3292f46600580
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 10976 bytes
SHA-256: f9fa351f3129854980dccc79ab246a8439a26728c38da173463dd1f5a4ae7d0e