Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ac3b568807c41e…

MALICIOUS

PDF

73.3 KB Created: 2021-02-12 17:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 507932acf78a575cc84034e9d6bca03e SHA-1: a3f61709c21257e3591895c017a73efcfd0713d0 SHA-256: 85ac3b568807c41eba9b1c5d7d0025da3a48e9f200c615b2b45ba73494aa7d13
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link-farming campaign. It contains numerous external URLs, including one pointing to 'maypoin.ru' with a keyword related to game cheats, suggesting a lure for potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=fifa+15+coins+generator+ios+13
    • https://cdn.sqhk.co/gagobuniponi/oxMiaig/14960799832.pdf
    • https://cdn.sqhk.co/lafuwexale/bhfidaU/light_bike_io_2_apk.pdf
    • https://cdn.sqhk.co/pezolaje/fgfBETO/guwalabavelokesidurar.pdf
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5ff6832422e52.pdf
    • https://static.s123-cdn-static.com/uploads/4410204/normal_6002caadbec16.pdf
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5ff04a5b8954e.pdf
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/zesofudusopudunomiju.pdf
    • https://cdn.sqhk.co/wemojezuvegi/hfHrMii/gisobuvagojetedifel.pdf
    • https://static.s123-cdn-static.com/uploads/4385202/normal_5fced99dc256b.pdf
    • https://cdn.sqhk.co/boguzivipel/dG5mJgg/word_nut_level_108.pdf
    • https://cdn.sqhk.co/pejinijew/fjjgdyx/buwumofepesase.pdf
    • https://cdn.sqhk.co/wezufunin/Ohdibih/disney_coloring_world_coloring_pages.pdf
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fdf6105ce791.pdf
    • https://cdn.sqhk.co/tivanosox/jficxjg/7408763975.pdf
    • https://nupepapeziwib.weebly.com/uploads/1/3/5/3/135319604/latiwedexini.pdf
    • https://cdn.sqhk.co/xafeperale/xbggLif/memiwisibakof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/degisapemifa/2876150645.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27f.bin
5193d93b2d74e335a28931657c58978b0f94ee35c10aa47b9e22b4c9f924db3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 5312 bytes
font_01_sfnt_off0000f4b1.bin
07ddbbdc4d5bfb7f1273d6039cff1bf197a0db92ec99a4ea4730cad8d09b9fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 10288 bytes