Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba336af332897efd…

MALICIOUS

PDF

74.4 KB Created: 2021-05-02 22:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b54bb4fc9934c6cff525741f5bb5e328 SHA-1: 752cbdaa44650bf30791a383663a8187dda8366e SHA-256: ba336af332897efd4562a41b837f7989879ae9869969113ace2de4334250f669
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on 'seumenha.ru', which is flagged as suspicious. Heuristics indicate the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=the+advancing+guitarist+ebook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448735/normal_602f9c8033a61.pdfIn PDF document text
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/nexavukug.pdfIn PDF document text
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/3291854.pdfIn PDF document text
    • https://xulijuba.weebly.com/uploads/1/3/1/1/131164032/jitogejeratema.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/what_does_chi_mean_in_chi_st_lukes.pdfIn PDF document text
    • http://familyit.info/english_comparatives_and_superlatives_exercisesfb3oc.pdfIn PDF document text
    • http://justiciaforjustice.com/how_to_charge_with_power_banka1llt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_60479d6d0331f.pdfIn PDF document text
    • http://normal-id.com/515127784311swlz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74179acd-b935-48d3-bbdc-684048854e01/70740897727.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/setivepup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81dd305f-ac3d-4488-b0cd-bb9bd0bef2f7/are_frigidaire_affinity_washer_and_dryer_stackable.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/gosumikozogimuniriru.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/is_little_fires_everywhere_a_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/atoms_and_elements_the_nuclear_atom_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028e1f4d-e40b-4a09-9142-52140ddf17c0/99987205913.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/navud.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 5384 bytes
SHA-256: 14ff9e7ca84e7bce7faf1b7dc05c317e2e5e154f93c956fa57d648ddfedd8c9f
font_01_sfnt_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 12284 bytes
SHA-256: f5cbde43d7d00276e91cfede9407b564357c7dff9d6a812abd342ec977388da3

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