Malicious PDF — malware analysis report

Static analysis result for SHA-256 645ab7d5b4a100d7…

MALICIOUS

PDF

77.2 KB Created: 2020-11-20 07:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d2b74409d5f89989f936406b2fc1cea4 SHA-1: 9932a20ecc601513731dc76ba2077bb28056b2f5 SHA-256: 645ab7d5b4a100d7161a51704c2db624bd0c57d6c6d2e196025af6b88aa718b5
214 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, and contains a large number of embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'traffine.ru'. Another heuristic flags it as a PDF link farm, with numerous external links, one of which is 'uploads.strikinglycdn.com/files/2a5ff02e-42af-4696-adff-ba5ab64f3ca0/xosezin.pdf'. The document body is heavily obfuscated and unreadable, but the heuristics strongly suggest a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=android+phones+with+headphone+jack+on+bottom In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f873efa94aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fb256e378dc0.pdfIn PDF document text
    • https://noxutepobop.weebly.com/uploads/1/3/4/5/134510102/2166832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f9dc30b2ef06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5f9658dc6d0d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f925e860184e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2a5ff02e-42af-4696-adff-ba5ab64f3ca0/xosezin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5006083-2962-4723-b766-f8be455c04e3/34625361855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be4fc04-6dc0-4bfb-a3eb-52adc6a0a065/pomazuxebob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e5b177-1f9c-4cff-bde9-2183439b9353/nawukavazeduxem.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC637 5432 bytes
SHA-256: fd1ae05cbaba6cd8e22f16151eea91a83ffe3a036b404ccc21b2077f0867fc6c
font_01_sfnt_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 11132 bytes
SHA-256: cc9e4f1ffd78acabeb9f7fe14bce44d63114940aa204f2126c09471ac28ec12c
font_02_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 17804 bytes
SHA-256: 24aacbdbc1e9d6f19d6d73f28e21d42cd9fdcc60bc603bd84a5010651840a1f5
font_03_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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