Malicious PDF — malware analysis report

Static analysis result for SHA-256 7494966eb46e96a6…

MALICIOUS

PDF

81.6 KB Created: 2021-02-15 21:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d287c4acbace9958f331ff1b9184c05 SHA-1: 571792942f93789d4b4c950a672f93d7fa2287df SHA-256: 7494966eb46e96a67cf74ee21f4014490a11f7599df51ce0f920d550766bbe17
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though truncated, contains metadata suggesting it's a generated PDF, consistent with SEO link farm tactics.

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://leonvi.ru/123?utm_term=mcsa+windows+server+2016+study+guide+exam+70-740+pdf PDF link annotation
    • https://cdn.sqhk.co/luwosera/ijiIhbh/66894526107.pdfIn PDF document text
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/nexokiropig.pdfIn PDF document text
    • https://cdn.sqhk.co/filovixedalu/hawgcaf/download_server_info_minecraft_premium.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/DjihZLE/kerurawovimese.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/niragorumuse.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/ge27DK2/kosekopepunanatutel.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/25d6538b.pdfIn PDF document text
    • https://kinefowez.weebly.com/uploads/1/3/5/3/135329655/32406.pdfIn PDF document text
    • http://probmake12.xyz/73767224396v4cqu.pdfIn PDF document text
    • http://hookup754.fun/rimegerolurom188pr.pdfIn PDF document text
    • https://jepuderakemuso.weebly.com/uploads/1/3/4/6/134666912/1724205.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/mosunof-nakuzogoxaso-vugijavovufitin-xazapuzufi.pdfIn PDF document text
    • https://cdn.sqhk.co/semegopo/jeT35zq/runaway_christmas_bride_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jcjizJS/18441293230.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/KvEjjjj/zombieland_2_cast_interview.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wemazepiba.epizy.com/cabin_crew_training_course.pdfIn PDF document text
    • http://rosukijabadizi.epizy.com/audio_visual_video_maker_apk.pdfIn PDF document text
    • http://gorevifero.epizy.com/algebra_2_rationalizing_the_denominator_worksheet_answers.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_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 6452 bytes
SHA-256: d062dea7957067a077e1620b313daf7d0adb4b885952e180a9fc15ac9f363c03
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10604 bytes
SHA-256: f162d2e60aa55c8c3a30468fce9479621a9be7d0d4f0de6791ee5fbfbdb74be1

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