Malicious PDF — malware analysis report

Static analysis result for SHA-256 f286d4ac932085dc…

MALICIOUS

PDF

77.2 KB Created: 2021-02-27 20:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f9e273b46320bc341e28d5c2f2e5231d SHA-1: 51b21dae4127afd60b24f0761744915a1757982a SHA-256: f286d4ac932085dc08d306f1c72e128629dd87c516f08ff483849f0d416d6510
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/strik?utm_term=what+happens+when+the+garbage+disposal+stops+working PDF link annotation
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/vegozibofe.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/likam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497658/normal_6008781ff3b8e.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/60682.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/jomebuxobufajar.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/mojukusiduz.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/VIhgvzr/free_download_video_downloader_application.pdfIn PDF document text
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/ded998928.pdfIn PDF document text
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/589835.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/h5zAlge/racing_in_car_2_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_602fa082bc4a5.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/jmVy0ND/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_60335f9e19092.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/atzugif/winoxixozoviwiwuxubi.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/jgcuuid/rise_up_game_online_unblocked.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/69161178734.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/hcicGwZ/7128572282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd6205661fc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_60126d2c9d124.pdfIn PDF document text
    • https://cdn.sqhk.co/vikeguzag/hfhjFje/top_run_scorer_in_ipl_2020_cricbuzz.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/mojurejajerikinale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/effectual_definition_used_in_a_sentence.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/zajov.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_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 5528 bytes
SHA-256: d40d8a3079bad112c4f7da68d5e5e7c2530c48c98061321eb147ccafa6091259
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 10088 bytes
SHA-256: 08272379612f8fe82b8cb0714e0d163f78b89322b8df31c8e836f31c5b397543