Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c6cd6fe5a54d1a…

MALICIOUS

PDF

83.2 KB Created: 2021-04-07 21:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ff52db595d2f4d9d8ff13d13da92582 SHA-1: eab0d6ce351296fd90998bc7518a73fcbefba5d3 SHA-256: 67c6cd6fe5a54d1a65fb12a88ddf314af5a6654ebed36b0ca50072244aaaa1db
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification indicate a high likelihood of malicious intent, possibly to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=turkish+march+sheet+music+flute
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/tupubo.pdf
    • https://static.s123-cdn-static.com/uploads/4465386/normal_5fcce713cd0e8.pdf
    • http://edarudost.online/57599635587vdm7f.pdf
    • http://mainsale.info/92554570374r2itj.pdf
    • http://xviiivbgz.com/pals_provider_manual_2017dqhwx.pdf
    • https://cdn-cms.f-static.net/uploads/4401519/normal_602723077a31d.pdf
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/cab16b4.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/19c55cf114c.pdf
    • http://opros.xyz/tamotuzakawea2grs.pdf
    • https://cdn-cms.f-static.net/uploads/4425912/normal_605c40fbd39a1.pdf
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdf
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/a1d622003343b5.pdf
    • https://cdn.sqhk.co/fetadupozo/hjeZgj8/tifamivuzikezapima.pdf
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/1065039.pdf
    • http://lessonsonline.site/police_reports_brattleboro_vtz5lth.pdf
    • https://cdn.sqhk.co/tumosirewuw/ZhbzibB/oregon_national_and_state_parks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_9aae829300b94139862104741fe47b79.pdf?index=true
    • https://dfde94ff-8c6c-411d-9c04-f18b57906ec7.filesusr.com/ugd/47ec90_33da839920b74528a259d505f21a52e9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef4a.bin
3d7afd1fae24eaebded89b15fdc86200e39f9a5b0d99256c0f9e9fdc207798b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 5132 bytes
font_01_sfnt_off00010093.bin
b9d3478e37d113c0e11e541a48c4eb58745dd5237f1ae75cb34da4fcf869b6c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 12808 bytes
font_02_sfnt_off00012a4e.bin
59d1d26520e6cd1cf6dcc0ee873e992c324360c6fefec2768f5bd35b97b85629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 16184 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.