Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7422f3d116d0e8b…

MALICIOUS

PDF

77.0 KB Created: 2021-02-09 14:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9bd06cef550437293211eb8cbebf32e4 SHA-1: 112dbd70b8116c302b7e06a589a01854a2e52fab SHA-256: d7422f3d116d0e8b99218ecccff7accd26ad93c07e97ad2ac290637187577369
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed to facilitate external redirection.

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://seumenha.ru/123?utm_term=del+norte+county+jail+letters+to+inmates PDF link annotation
    • https://cdn.sqhk.co/sutekepape/gehh6jf/55664507075.pdfIn PDF document text
    • https://cdn.sqhk.co/sesakiwewe/zZNjh9k/62252494835.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/lakolojaxe_miranuzi_wixilosebit.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/bjhaZhg/special_agent_dale_cooper_shirts.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/fghjekN/safari_przelaczanie_miedzy_kartami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_5fd7d519525c1.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/56e675a9938.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/I9cc0ic/gunodisinebatebazeguda.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/gavore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466413/normal_6009019c768eb.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/icjey6o/bandi_chhor_divas_greetings.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/4f7ffc29dfca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fd159e33f668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5ffdfe88b3038.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/irhihi0/temple_spooky_jungle_run_oz_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/G82jjji/download_game_offroad_madness_mod_apk.pdfIn PDF document text
    • http://degadeg.22web.org/smash_bros_ultimate_dojo_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/jjiaif8/download_wallpaper_anime_sad_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/iihoPgi/2714210597.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://xexitotikix.rf.gd/29146870854.pdfIn PDF document text
    • http://napilidowolaro.rf.gd/multiples_worksheets_grade_7.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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 5004 bytes
SHA-256: e2fb6c99f44c8b968413ac40fb00ffb2a7eb9be5174217645ee0008c4ab37e18
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10204 bytes
SHA-256: 79d7838355ce34e1a59d3dc7b8f00e37641f5cb8dac9d44e2335c330500203cc
font_02_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34