Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99cefa96acc6c98…

MALICIOUS

PDF

66.6 KB Created: 2020-11-10 03:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e509998a822baaee4e481815389bce15 SHA-1: bc9b906e2d2c8be372690bcd2c414b142cb6897f SHA-256: a99cefa96acc6c984042f49f2d7af578b7e81867837db433ecc112861edefc8d
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 0.9998

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
  • 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://trafficel.ru/strik?keyword=words+with+the+prefix+scribe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fa9e77100976.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/9276785.pdfIn PDF document text
    • https://kotidirexi.weebly.com/uploads/1/3/4/3/134358756/funitegisefuxazif.pdfIn PDF document text
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/rokutokifawagev_revusekikex.pdfIn PDF document text
    • https://teraxawazolazov.weebly.com/uploads/1/3/4/3/134386914/5448231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f946794c6ff5.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/2973348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5f9ec660580a0.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/685111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fa4659cba571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5f9b6611ebd28.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/liguwubore/gifted_biology_with_coach_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7068a53a-e273-4662-aa9c-76a24cc24de5/ratomovovavatenubixaduz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0914888a-2a41-427d-9d00-445659c61670/30434455000.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/jifunovosexanesad.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_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 5316 bytes
SHA-256: 5ff5bebac33c6d11c71b0075c6458818173c747d40a9a9f8ea571d0173f9bbea
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 10484 bytes
SHA-256: a35956a8fc0d63998ff224074abf4976f21871f8d92a06e8456b194742b78248

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