Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ed4e02f30301c4…

MALICIOUS

PDF

70.6 KB Created: 2020-11-24 07:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 81aedb977895f1112667404e020ebac3 SHA-1: 935d2649bb9da1edd26fa968ba53db42f1df0c2f SHA-256: 90ed4e02f30301c4f31791f58de5ac13499626d3afc6e1b1b656ebd0a6fe765c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=asco+cap+her2+testing+guidelines PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7007845.pdfIn PDF document text
    • https://zasipirowi.weebly.com/uploads/1/3/4/2/134266189/3aa55ae1b904fea.pdfIn PDF document text
    • https://wokepugef.weebly.com/uploads/1/3/4/9/134901336/7d88640b20.pdfIn PDF document text
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/96183.pdfIn PDF document text
    • https://sanaxuruvumuvuk.weebly.com/uploads/1/3/1/4/131438582/rajibov.pdfIn PDF document text
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/e4547.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/mozosotoje_femewe.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/xitix.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/a5c52d6d-3a47-4a4a-8d8f-5da640d6f3af/pazubujemilamagilebazu.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/27206787652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfcf573-c9bb-41de-a537-2b92b58bc87b/kebovibut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4861f7c2-3211-4f54-aa1f-3f0e2832a657/gabeguvalapasixuditab.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_off0000d402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD402 5456 bytes
SHA-256: 5fbee78bf53144663f743f7a61fd3f545cd2f164459dc698e7740719070b5393
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 11612 bytes
SHA-256: 7917ead178cf2f5107051d92c70bb5b1f535b0bb48538a31c1315472f77ad4fc

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