Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4ab8d9ca63c162…

MALICIOUS

PDF

73.8 KB Created: 2020-11-19 03:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bfeaf3b6f71b3cc0d0bb0093e959a1f6 SHA-1: 7021abe0fef34156a6d0dd0e02ebe89fb44d40ab SHA-256: ae4ab8d9ca63c162344d7ff48d7387eeb46f89d9ed82faac05b392ed01bcbf2d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF files, likely for SEO manipulation or to distribute further payloads. The presence of multiple disposable hosting domains and UTM parameters suggests a campaign focused on traffic generation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/123?utm_term=burned+ellen+hopkins+pdf PDF link annotation
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/dojimuruwude_jigojapixo_daliwege_pinajibipe.pdfIn PDF document text
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/vusaxulamenuxupobame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f9257d837075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8ce97fae7d1.pdfIn PDF document text
    • https://voradirara.weebly.com/uploads/1/3/4/7/134744625/d79a9e.pdfIn PDF document text
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/7818836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fa1e78927592.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/lalupovafomorumiw.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/0b0322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5f945cd1e24c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_5fa183e37b1f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_5fb59cb96da2b.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/tusuluselu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadobirak/memopubepuku.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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 5032 bytes
SHA-256: b195b23279895910ea5e13e3f8d954d321a967e5831a495a8e42b5e275793c48
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10624 bytes
SHA-256: f8a4d4fa3bb72f55972456e5e3c2c85d517f3cf1a34f8346f4977e6778164762

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