Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b3a8f5fe0525d6…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 23:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d5303222a86c21a4844fa85a12c7ad7f SHA-1: 51144c165046b08af70ea15556d168f83d9c9eac SHA-256: 06b3a8f5fe0525d6474029105b67db1367e43a30dd50c344cba941c60ae1faae
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://lozipotod.ru/wix?keyword=polyatomic+ions+pogil+worksheet+answers PDF link annotation
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/tumogesurujokilo.pdfIn PDF document text
    • http://tixshopclub.fun/gusitubatorekeseviwoubh8m.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/aobifij/joker_music_video_dj.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/dhaXihh/unique_facts_about_american_culture.pdfIn PDF document text
    • http://copyrightproblem.com/12246960827paxnm.pdfIn PDF document text
    • http://e-sparks.ru/bajexijavixawuvubem794op.pdfIn PDF document text
    • http://nigma24invest.online/rejadazemujamokinimilabeb3bvp.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/025dd9a3.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/zaful.pdfIn PDF document text
    • https://dijodiruji.weebly.com/uploads/1/3/4/0/134097483/d1aa5.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/6RCNuA9/bhojpuri_song_dj_2020_ringtone.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/rewusapibo_fuxip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/image_search_man_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/38389485799.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/chi_health_council_bluffs_mammogram.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 5608 bytes
SHA-256: 8dc3b2f48044430b91aab564f120d77dab8cda5ee8d5fd1c922e824118ac099b
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10604 bytes
SHA-256: 82e9715c4c80e91a742bd86a13f758a512fc4b18f99383fd5562ef8714f27cb7
font_02_sfnt_off00011201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11201 16700 bytes
SHA-256: 01680789fe431a08a5fb2daaee037d690e4c896c7425ce9dbc0fea99fa8630ef

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