Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6553780c973f35…

MALICIOUS

PDF

62.2 KB Created: 2020-12-30 09:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdca197a52d3fedf6a22817588541e07 SHA-1: b9130fdbc02a61c66a04f0798734ed3965e03a2e SHA-256: 5f6553780c973f35cd03356e7f1e9840c5d2dc59fb696b4f4bbf7be88e5c2929
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains numerous embedded links, identified as a link farm, directing users to potentially malicious websites. Heuristics indicate it's a redirector link and a phishing trojan. The presence of multiple external links suggests an attempt to manipulate search engine results or phish users by directing them to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/strik?utm_term=froggers+menu+calories
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/talivobarifo_rotitipaz_tazilibarug_nolobexax.pdf
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/tetaraluloge.pdf
    • https://cdn-cms.f-static.net/uploads/4487419/normal_5fbc72e3d2507.pdf
    • https://cdn-cms.f-static.net/uploads/4470232/normal_5fac020da9e00.pdf
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/3df26f4.pdf
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5fd5f0c2a70c5.pdf
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5fe15b0cc621e.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5fd783368886c.pdf
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fdc4bf6854d2.pdf
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/ronunatig-wafamum-gezaporivefuk.pdf
    • https://static.s123-cdn-static.com/uploads/4447436/normal_5fe3b296ead2e.pdf
    • https://cdn-cms.f-static.net/uploads/4501963/normal_5fea21fd62afd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nerugiraxura/kivuwumufuzan.pdf
    • https://s3.amazonaws.com/buwosevax/atlassian_git_cheat_sheet.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_off0000b88b.bin
82518f510618b5677e448af8043fa863fe24aabd69ccc3fc44c80e8c721269d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 5072 bytes
font_01_sfnt_off0000c9b8.bin
77fb4c0795a0409a6991774426c1b1f6b9ba435ba203343695ab431590b910eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B8 10148 bytes