Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b09816e008f515…

MALICIOUS

PDF

68.0 KB Created: 2020-11-11 17:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c664ddee15de037f21f3b0af1d134867 SHA-1: 1f36bf8da08843d09ec781546ae1e43411eff7a0 SHA-256: 20b09816e008f5152e90e166b6100a8870f4dcb41b64d6a9f8e4875751d6a824
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing lure. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=summa+daemoniaca+english+pdf
    • https://pefemodadiz.weebly.com/uploads/1/3/4/5/134520562/belevevad.pdf
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/weguki.pdf
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/9711c1e7.pdf
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/21e75.pdf
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f875687424d7.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/jalalewis_wakogepomopax.pdf
    • https://puxusatorujebi.weebly.com/uploads/1/3/4/7/134749887/3e6cada61ea6.pdf
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5f9139adc76e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a0abfa0-ffdf-4347-8f63-79e9d0a38ba5/bimuzudajobe.pdf
    • https://s3.amazonaws.com/luxelula/mega_man_x_randomizer.pdf
    • https://uploads.strikinglycdn.com/files/77a4e5d7-8901-4496-b8f1-849dda8db453/zuvutujekigov.pdf
    • https://s3.amazonaws.com/wanasuvedigo/towabafif.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_off0000c91a.bin
0bb79354e73b16dc5cabfa25efb3a3a4a42badf0c1030d09a34823795ea42a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 5576 bytes
font_01_sfnt_off0000dbee.bin
02bb4edac87d571cf4a8472c77a354cbfa6ba73097e8cb3ba4c47ac1f753a48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 11652 bytes

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