Malicious PDF — malware analysis report

Static analysis result for SHA-256 57371f2e1a23f51e…

MALICIOUS

PDF

97.3 KB Created: 2021-03-15 22:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e1be60dde7062efd6fadf4d2f2515f2d SHA-1: 2ae82be6bd3b6801eb59ee2d0bb774e4e476fce5 SHA-256: 57371f2e1a23f51e8ec45e19dfc9f7da74e36fe52f8fb826d07e8c9bbc493ad1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. This behavior is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/wix?keyword=reaction+of+esterification PDF link annotation
    • https://cdn.sqhk.co/terodekijur/4OidOid/52889011872.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/hxVti2a/download_videobuddy_for_iphone.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/83214.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/icajihj/22148248795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_5fdbafb9a7181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_5fd95bc590fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_5fd9809b80237.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/pajaken-gujowoserinizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_60130636d4851.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/95504437716.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/73046022775.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/rusili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5ff866ec0a141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489979/normal_5fef0fad8a35b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fefe08819d21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_cd964dc266e547a4ae3a023468dc8f95.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_0860e061420a4dce83de68b80b84df34.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_b3d42dc7b7e04e39bc45a6ac861f0177.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 4848 bytes
SHA-256: 344b0429897a5c49c1fa852cf8f304f6007b4a97712a94089be4789ca6ce8c6a
font_01_sfnt_off00013849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 12944 bytes
SHA-256: c368728bbe093f44fe07d227e2ba78cf5008469b1fa1af521e6d8e8ba2453f5f
font_02_sfnt_off00016354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16354 16100 bytes
SHA-256: f4f5fb0209a4714c3cbdfe9b8e29dbdabffe5d2cbe58e8cc741460ff97ba63ed