Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dcf96b1d8cee07…

MALICIOUS

PDF

72.3 KB Created: 2020-12-28 00:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ddc327648110e8f3cee9492a288a1aab SHA-1: eaa232736a22b1204c4b8f8402b8f401b84e7b1d SHA-256: d9dcf96b1d8cee075185eb026bbc1fa598b003c14f5691ebe673c2ad7c682644
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of multiple external links and the use of disposable domains are strong indicators of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafftec.ru/123?utm_term=jean+jacques+rousseau+emile+oder+%25C3%25BCber+die+erziehung+pdf PDF link annotation
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/kekovexalitosex.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/5718005.pdfIn PDF document text
    • https://pemovoxi.weebly.com/uploads/1/3/4/6/134680353/4e6575.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/6823092.pdfIn PDF document text
    • https://tazorigebug.weebly.com/uploads/1/3/4/7/134766075/4445195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f93e3cba0b49.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/bekupufuxov.pdfIn PDF document text
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/a52db75b.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/puzogi.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/1098901d-c5fe-4e2b-9f22-aef54c5fdbd2/33085175685.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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 6072 bytes
SHA-256: e80d5dbb9334cdd80114a8f39e440e380e868cc126a98242ae928e376b369b22
font_01_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 11216 bytes
SHA-256: 848f980032424b90f40c68089baf6f636ffd06831be3cfe5bdd9937335247534

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