Malicious PDF — malware analysis report

Static analysis result for SHA-256 274d0e9d4fdf0ffd…

MALICIOUS

PDF

69.8 KB Created: 2021-01-13 03:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50a0a9585112de90a5193c1bbe417048 SHA-1: d031e35f364dabcf1936b29dabb4eb10645dbe36 SHA-256: 274d0e9d4fdf0ffd4ce752a2607d3f4c9737d9b063cc718ece3bac8185c4670b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links are likely used to redirect users to phishing sites or to distribute further malware, aligning with a spearphishing attachment attack pattern.

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://traffmen.ru/123?utm_term=holley+carb+tuning+tips
    • https://static.s123-cdn-static.com/uploads/4444104/normal_5ffac3d773b5a.pdf
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5fd0a642f1886.pdf
    • https://razavewi.weebly.com/uploads/1/3/0/8/130813306/e0b355a.pdf
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/3929250.pdf
    • https://bivuremopukojez.weebly.com/uploads/1/3/0/7/130740249/wemibojopaji-gesopotexaxojad-kidizek.pdf
    • https://zofoneparadi.weebly.com/uploads/1/3/5/3/135341866/zenowusuki-gereza-jokonum-narox.pdf
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/zezez-lapulovukurojal.pdf
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/4cd7484.pdf
    • https://cdn-cms.f-static.net/uploads/4486548/normal_5fd79e98df19c.pdf
    • https://cdn-cms.f-static.net/uploads/4411512/normal_5f94496abb043.pdf
    • https://cdn.sqhk.co/girolivudafo/iV9ieBr/what_the_fight_unblocked.pdf
    • https://static.s123-cdn-static.com/uploads/4366321/normal_5fc739501ae95.pdf
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/gizoranu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d3c6.bin
1f81a71a5def120e6bf6d0461e712098dd94a45592c28031ffae24b8ec007183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 5304 bytes
font_01_sfnt_off0000e5e4.bin
bdbb89a9e309e0a625f4a720b4254e27484027a3d94a80431caf58c656c6e750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 10828 bytes

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