Malicious PDF — malware analysis report

Static analysis result for SHA-256 119ef87fa2ade598…

MALICIOUS

PDF

66.8 KB Created: 2020-11-26 04:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ba9b2ccc659d988f3e3fac13ec89ac4 SHA-1: 1db7b673893cb202135b951af3e986d331915222 SHA-256: 119ef87fa2ade598737f3ec43d45de33a774459d643afe29581b7bc72ab016a9
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains. One URL, 'https://gettraff.ru/strik?utm_term=cps+edu+library', is flagged as a malicious redirector. This indicates the document is likely part of a phishing or malware distribution campaign, using a link farm to obscure the final malicious destination. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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.
  • 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=cps+edu+library
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fa75fe011401.pdf
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f9367844ea9d.pdf
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/vururozejetuko.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/ranuwezabeli.pdf
    • https://tovuwopisivid.weebly.com/uploads/1/3/4/6/134640328/e071bb4f09ee48.pdf
    • https://muwigoxafom.weebly.com/uploads/1/3/4/8/134869335/cee25bd9.pdf
    • https://wunamixexot.weebly.com/uploads/1/3/4/4/134456109/wobelofe_vekedatuzago_bulefititurumu_xolatopefe.pdf
    • https://rulurutepiket.weebly.com/uploads/1/3/4/8/134881251/xukotuketowu.pdf
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/pimeditiwebamebeje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a678d90-890d-48cd-a836-f957137a4a85/78578683342.pdf
    • https://uploads.strikinglycdn.com/files/ed449e86-1d48-4a89-8daa-c05049094f5a/kitavox.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_off0000c91f.bin
a810a71be8158ec62bb3009ed347138a981751cdf8dcb423a23f0bbf1382137c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91F 5100 bytes
font_01_sfnt_off0000da78.bin
862c57c11ff7d2d04654f5ae23ca06d5e7c610c4527cfd9dd67fb6c88cc67e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 10768 bytes

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