Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bafc2cf4bf8966a…

MALICIOUS

PDF

70.0 KB Created: 2021-02-11 12:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9e7ec85488a66f078c040ebd78ae1175 SHA-1: 24266f313adfd695e7473037aaa036d924a1ea97 SHA-256: 6bafc2cf4bf8966a1422db21026bdaca059f986feca7d9c5bf695367c3d3ea84
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/123?utm_term=burkburnett+high+school+football+roster PDF link annotation
    • http://bluetea.space/puvubosetpowrj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455399/normal_6010e2320a168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_600c6542c9d20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fde7920c6a9c.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/2366280.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/rininujamifetu_buvafoxa_gotebole_bavakuv.pdfIn PDF document text
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/5e3d6df19c7.pdfIn PDF document text
    • http://vuzopozakobepe.22web.org/lutheran_church_history.pdfIn PDF document text
    • http://copyrightmediahelp.com/corrugated_sheet_suppliers_in_sharjahjp51f.pdfIn PDF document text
    • https://jasugigikimodo.weebly.com/uploads/1/3/1/3/131383258/cd308b48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funazowo.rf.gd/loregofegobijumisufir.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/47246309607.pdfIn PDF document text
    • http://xupapuxonoxun.rf.gd/chisel_and_bits_mod_1._14.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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 5396 bytes
SHA-256: 4e82cbe68f608b607c563d1814bac6a47e6144f466bb7e8ced0ed9be9315b1fc
font_01_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 10716 bytes
SHA-256: a0fc4b85d1c74608c73327a8687807e59d3a21541bf2f785ce2129961b489a20

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