Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed248890ab3629ff…

MALICIOUS

PDF

73.7 KB Created: 2020-11-27 11:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1d5430413787c9f2ce6f4c57853ca43b SHA-1: 1b04fc9f30704874534d3b155c2ead3c209d1ab4 SHA-256: ed248890ab3629ffc71a55a71429424ba319efa119055089181e95a61b767ca8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these URLs, https://traffnew.ru/123?utm_term=knight+moves+in+chess+java, is directly extracted. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=knight+moves+in+chess+java PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471240/normal_5fbe1d6b98534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_5f99bd82e28d6.pdfIn PDF document text
    • https://voradirara.weebly.com/uploads/1/3/4/7/134744625/8044373.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/bawasezanefidan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_5fad560d1019e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f8b0a9e8b7c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5fad8838edba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fb9d0a2f2063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f94628976d96.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/tugabijenovili/ineos_styrolution_group_gmbh_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cf4114-677a-482d-a6c5-b50a475541fb/kanefetedajitafawarinumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285b94a3-41dc-4d34-a716-aa43d41a38b6/pewobizabuluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16dc10cc-c771-4dcf-8fc3-adedb55d6959/56332102556.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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 5192 bytes
SHA-256: d4c69d531e5b0a6c3f210a14a1e3c465b578340656f1985a8a6b5d71cb8a4ac1
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 13208 bytes
SHA-256: 9ba97bb6a7725dba5a0ec3efa009c8d338ad57b8e722f1d45b57a33e4804e3f3

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