Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a5eefc54fce2d0…

MALICIOUS

PDF

60.6 KB Created: 2020-12-30 19:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 85f82e0b64e864f4f784259258d7b05b SHA-1: 63a508ca9ea855273e53191407ac25714e266986 SHA-256: 27a5eefc54fce2d0505018be2155c3eedabea7a86463e6dc18482c3e5d457b96
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or malware distribution attempt. The document contains a large number of external links, suggesting it is part of a link farm designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs strongly suggest an attempt to leverage embedded links for malicious purposes, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/strik?utm_term=hexbug+airplane+launcher PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470409/normal_5fe8339dcb974.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/1507412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5fd289e8a29a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5fad5636669fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_5fd73c89b0359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_5fb5392803acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_5fc29e5e32e74.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/75562c7b-db21-4507-9d47-a3c2eabd9a0a/57421448187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b61eb8-0e94-4e9f-999f-1a4c87c4f216/51621860644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ed26e8-11b4-429d-ba98-19fb00eb81c5/novediru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ba62d8-e05f-43fa-9d58-ac749577b4bc/unblocked_games_88_running_fred.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66a9f3a-da21-4f8a-a9f3-48766242403e/zidef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5d4a76-7051-417e-a014-c0a389f71456/paul_washer_election_and_depravity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5988ac3-daa7-4c0b-88e6-0244adc5df64/zoganuxiroxozagu.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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 5184 bytes
SHA-256: a6f9c6ef79e7077214d93dba8ed5a57a0395da9d5e9abdddae52d63a400e4a9b
font_01_sfnt_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 10072 bytes
SHA-256: c0408f113039bea3de03877e177aba735b10c5d69254cf8363876d2fc2d54811

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