Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d07e5ea535a2e8…

MALICIOUS

PDF

66.1 KB Created: 2021-03-25 03:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b04e826fce94719e57947c25e6d52f5 SHA-1: 82d00373067a2c9fe65bb865821b65f2d169928b SHA-256: f9d07e5ea535a2e81dbd0543b76d03c8af598c9f5e019dea67d30b0e6b572ae6
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, suggesting it functions as a link farm, potentially to distribute malware or engage in SEO abuse. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=gramatica+b+ser+and+estar+answer+key
    • https://cdn-cms.f-static.net/uploads/4379236/normal_6054f96c3c51e.pdf
    • https://cdn-cms.f-static.net/uploads/4461229/normal_604461381f66e.pdf
    • https://cdn-cms.f-static.net/uploads/4446264/normal_601608aa4da3a.pdf
    • https://cdn-cms.f-static.net/uploads/4379969/normal_6014f4c6d06c5.pdf
    • https://static.s123-cdn-static.com/uploads/4445541/normal_5ffa1db6b49f4.pdf
    • https://cdn-cms.f-static.net/uploads/4488116/normal_6035d0755a1c2.pdf
    • https://cdn-cms.f-static.net/uploads/4467915/normal_600fa40fb7864.pdf
    • https://static.s123-cdn-static.com/uploads/4486975/normal_6007623263720.pdf
    • https://cdn-cms.f-static.net/uploads/4478414/normal_600e8e9fee18f.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_601e6897e2d69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_7a99c6e1ed4e4494a6db1ae163af91e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3ca3034-2ae5-4644-b6d9-a205ce4a0fad/the_manga_fashion_bible_espaol.pdf
    • https://s3.amazonaws.com/muxegeza/47641616958.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_b9e3154f19684394939d2b4e0c4cd50b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf37b29c-d188-4ed0-864d-5412e87f5324/wipafirivep.pdf
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_09d2d77f81c347498bca40ea8df74131.pdf?index=true
    • https://s3.amazonaws.com/gisujubolidine/advanced_bat_to_exe_converter_pro.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_4d1ce43bd356450dab831e6c85a2c6a0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c470.bin
0481dbe784ecf046b4686e4b3a47fedaea89d82cef2a3986d8686b868f5d8590		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 5484 bytes
font_01_sfnt_off0000d718.bin
32c6137aa88d42d73adafdf27d4c10460f81969dfd019f37622e92242a28d209		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 11060 bytes

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