Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd35aafff8b1d55f…

MALICIOUS

PDF

66.9 KB Created: 2021-09-30 17:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62107fd5b001bc048b948e0dc76a8dfb SHA-1: 0545747feef55805e99c51164257e6b1c7e5d9cf SHA-256: fd35aafff8b1d55f3998f1a3994d5cd55d237327a2d782b0e60d13e4d1c5ee09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various PDF files hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://galsabino.it/userfiles/files/79065032243.pdf In PDF document text
    • http://gramercy-grand.ru/files/file/vepar.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/40898056383.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/rapiterukigogetagof.pdfIn PDF document text
    • http://standardamulet.com/files/files/kowajuxu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/kafenubemowotobanozanu.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/50131500001.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/janed.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902060015.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/83936748597.pdfIn PDF document text
    • https://pepsima.biz/files/file/kawidadeka.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wamizeta.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/eirmituvj5jsuiqj5aophimufg/bonixanalogitebozizegij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+can+i+do+with+granite+in+minecraftPDF link annotation
    • 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://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_off0000a5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5EA 10788 bytes
SHA-256: c2c4efbbda90ea288fd8c5cb1fe3c29efda1c31308af52c2a47b6755bf16b04a
font_01_sfnt_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 15828 bytes
SHA-256: 90e23a45bd1c406ffd0edbf43823712425e2c988231ee65f1e932570dda1bbdc

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