Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac820f15ac18d3d…

MALICIOUS

PDF

80.6 KB Created: 2021-03-17 16:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 475a67a008b7f638b78bb9d0feca44e6 SHA-1: 51f69c186f2256b1bd96592e302e8f4e4ae12d13 SHA-256: 8ac820f15ac18d3df4f33526a60ee3c56c603e65f0d5dd3efd82ad2567d36a95
156 Risk Score

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, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, forming a link farm, with the primary malicious URL being https://mezovuduw.ru/wix?keyword=ramadan+2015+dates+uk. The presence of embedded JavaScript, though not directly executable in this PDF context, suggests potential for further malicious actions if the document were to be processed by a vulnerable viewer or if it's part of a larger attack chain.

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://mezovuduw.ru/wix?keyword=ramadan+2015+dates+uk
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/9843406.pdf
    • https://cdn-cms.f-static.net/uploads/4484834/normal_603751c0a7617.pdf
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/nenadugodutajokofu.pdf
    • https://cdn-cms.f-static.net/uploads/4466175/normal_60139a6e4f781.pdf
    • https://cdn-cms.f-static.net/uploads/4486368/normal_6019c790cc3ab.pdf
    • https://cdn-cms.f-static.net/uploads/4478664/normal_60213f56e318a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_056675eda88d450db002413df2dcd036.pdf?index=true
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_327842946bed4a6a9f8d68781a8381fe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/263cf6cb-9d8b-4169-9ae5-2976d812ba41/jugogameteka.pdf
    • https://s3.amazonaws.com/nokiva/kemuwabegibarug.pdf
    • https://s3.amazonaws.com/dudujopixejikug/the_embodiment_of_scarlet_devil_free.pdf
    • https://uploads.strikinglycdn.com/files/43ce9b20-6a7d-4f59-8b78-aa518bf71975/xavevatexubunozag.pdf
    • https://uploads.strikinglycdn.com/files/80164913-ef46-4013-83a7-4e2dcbf7885c/41250629844.pdf
    • https://s3.amazonaws.com/fikuvine/what_is_the_social_contract_theory_in_government.pdf
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_fe80d61a31ab4508bd2580ede4728a69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/578f8922-9d32-41e2-bb7e-ed0de643ba6f/mavekujadapis.pdf
    • https://s3.amazonaws.com/tolivajupeku/free_french_books_for_beginners.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_a044eb85d78d41e4adea26b74ad4bcc4.pdf?index=true
    • https://s3.amazonaws.com/divikufifir/luzugamunogiwamalevipoga.pdf
    • https://uploads.strikinglycdn.com/files/b8734aa8-96b4-4940-a43f-216a49fb3b54/valupija.pdf
    • 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_off0000fbfd.bin
f9405445a8530a4a05b5642bd9154e4040021675292f5d3a5466f55999691331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 5364 bytes
font_01_sfnt_off00010e39.bin
4d07f507c3f5f835422711bad8262e01bd86e89b46ffee699a8e6b29ab01b351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 11672 bytes

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