Malicious PDF — malware analysis report

Static analysis result for SHA-256 9432eb987f10401b…

MALICIOUS

PDF

71.8 KB Created: 2021-01-07 22:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fa9da8a7badc78e4b5843402d2b412fc SHA-1: 9e1fdd5c2e7764ce6fc19582ba2b028dfbf1c0c1 SHA-256: 9432eb987f10401b39fc6dde54e0de7142ae5328bcc3bfd0abb12c23e2512aaf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to an 'Almanac book pdf'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially malicious websites.

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 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.
  • 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/aws?utm_term=almanac+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f8d2ece6d554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fa4fd0ef393c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5f93cc44ac5e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5fcbc20c62af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5fd38f6902fcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5fca344ec0d14.pdfIn PDF document text
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/1691086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5ff23508ca767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5fb5cab558184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_5fb7d764a31c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5fa978fed4ff1.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/ruzumeb/whatsapp_beta_for_windows_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da45c962-bd58-4dea-9008-d6215f5382ee/66783206412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd33815d-0f9d-4cae-b6dc-272f710012a9/serveur_media_orange_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/adobe_flash_professional_bagas31.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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 5220 bytes
SHA-256: fb93a230689557fec03a3fe378d95742db02111637a8fbb5269e1fac70cb2b7f
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 11056 bytes
SHA-256: 5fa04759306c1184cb77b711bccc40d874137c656b3f9775ecd79118847e1525

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