Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dcae9102d39f38…

MALICIOUS

PDF

80.0 KB Created: 2021-02-04 08:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3645e0d78d7703d2581e0a388ecaa1c0 SHA-1: b128e1e5f93093446cb2f7cd218baedd8416df09 SHA-256: d9dcae9102d39f38833dd0cc992e932608bf45df4b8b4e43316c3685dc863788
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and flagged as malicious redirectors. The document body, though heavily obfuscated, appears to be a lure, possibly related to financial reports, to entice users to click these links. The presence of multiple malicious and redirector links, combined with ClamAV detection and ML classification, strongly indicates a phishing or malware distribution attempt.

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
  • 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.
  • 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://yafferge.ru/aws?utm_term=zambia+auditor+general%2527+s+report+2018+pdf In PDF document text
    • http://svoytrylend.xyz/18066040406me8cp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_5fdc25486105c.pdfIn PDF document text
    • https://bowutemol.weebly.com/uploads/1/3/4/2/134234741/kilumufodemesa_jamititu_mimebopu_pejavovixezol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367937/normal_5ffa2c7041df6.pdfIn PDF document text
    • http://good-production20.site/galaxy_bowling_center_richmond_ky28tty.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/jubububanu.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/wiwoj-fufox-zokuputelo-gufatufafif.pdfIn PDF document text
    • http://trokot-newshop.online/10544399259qec8k.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/foxafupadiv.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/5579694.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/fabebutagafexag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_5ff4dfbb78513.pdfIn PDF document text
    • http://proita.fun/xorabemidaxgz2ta.pdfIn PDF document text
    • https://gobodozi.weebly.com/uploads/1/3/1/3/131398455/dabunebajivupadamupi.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/677b4d535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuzuvulas.epizy.com/pulse_secure_ssl_vpn_client.pdfIn PDF document text
    • http://wevevaviz.epizy.com/one_anastomosis_gastric_bypass.pdfIn PDF document text
    • http://kiralemosokeze.epizy.com/fidowela.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_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 6012 bytes
SHA-256: 3bd7c40c8165e60152fc351dfc170b71c1c59209efba632d495828d651fd1459
font_01_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 10468 bytes
SHA-256: 693ab4a8bb028aea69a89e13c4ef5b4a46a45484f84f7bbe3278cfc1c8e38641

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