Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f5ba67a769901d…

MALICIOUS

PDF

72.6 KB Created: 2020-11-24 07:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a9703b0d4abcf8b124e6b7058241a63 SHA-1: d37e12e3f88a29280cce4514e554913eb60d08c4 SHA-256: 64f5ba67a769901d64e80006d0f4341cfbc92e23b642e92620e94502d402b6b4
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links pointing to various domains, many of which are hosted on disposable platforms like Weebly. One of the embedded URLs, 'https://traffmen.ru/123?utm_term=papa+louie+3+walkthrough', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware via these links.

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-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://traffmen.ru/123?utm_term=papa+louie+3+walkthrough
    • https://kolapudavuvoxe.weebly.com/uploads/1/3/4/3/134315715/faxotolipibi_tajixaguka_pofep_bedutuniza.pdf
    • https://getugegifajit.weebly.com/uploads/1/3/4/4/134481189/6949897.pdf
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/gamiduv.pdf
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/ad3dd.pdf
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/33ae66bce0.pdf
    • https://guvorike.weebly.com/uploads/1/3/4/2/134266232/xunutusoruvavu.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/0cbd7f35736ab.pdf
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/8092313.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/vurep.pdf
    • https://lafowesatumu.weebly.com/uploads/1/3/4/5/134503032/a8c251294792f.pdf
    • https://webezajafe.weebly.com/uploads/1/3/4/7/134774073/3bf23d1.pdf
    • https://vejesare.weebly.com/uploads/1/3/4/4/134493146/6839475.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/juvosi/cherry_tree_primary_school_watford_ofsted_report.pdf
    • https://s3.amazonaws.com/waxapoz/bsc_nursing_physics_question_paper.pdf
    • https://s3.amazonaws.com/jezaxojipevu/movies_2019_bollywood_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d190.bin
c73b5949bd595307bb61200404b6de395bb1a857baf1ea172d6949008802f7b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 5000 bytes
font_01_sfnt_off0000e2c2.bin
85c9278da72f8d5aac6f43e16ee79d1e783e0e7dea3c7e0c6296da8270307781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 10800 bytes
font_02_sfnt_off00010793.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 4324 bytes

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