Malicious PDF — malware analysis report

Static analysis result for SHA-256 645496e3fe031b6b…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 20:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4208b661fd2b5814ffdb336691778e0 SHA-1: 9b56ef3d155a9df589fcd440b66e1562018f55f4 SHA-256: 645496e3fe031b6b1454a032ce3dee693ab885c1d84d8db52446f15145a6f7f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or SEO-farmed content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://nipisod.ru/wix?keyword=bayern+munich+vs+dortmund+live+streaming+free', suggests a lure related to a live sports event. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=bayern+munich+vs+dortmund+live+streaming+free
    • https://cdn-cms.f-static.net/uploads/4407303/normal_6014733b66917.pdf
    • https://cdn-cms.f-static.net/uploads/4422133/normal_605637429fc02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_ba11ac87c460465c83eccd6543133be5.pdf?index=true
    • https://s3.amazonaws.com/tosego/will_there_be_a_season_3_for_big_little_lies.pdf
    • https://uploads.strikinglycdn.com/files/0f776020-a0cd-4b8b-8e8b-7b717d83581c/jedozumukexet.pdf
    • https://uploads.strikinglycdn.com/files/783903cf-c1dc-471a-9114-5e60942b3143/25551986898.pdf
    • https://uploads.strikinglycdn.com/files/eec9b06c-7070-4856-978b-65958b80e39b/54014116813.pdf
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_64d54196151948cbb0ea2302e4d9f6e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c24e4b1-057b-42c2-b8c0-848282c0afe8/67950699743.pdf
    • https://uploads.strikinglycdn.com/files/0f24bb9e-1399-4ae3-9e19-c91b4ae43d14/78056835976.pdf
    • http://woniwasazox.epizy.com/16554790230.pdf
    • http://megutid.epizy.com/easy_film_trivia_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/b3dd26aa-faef-4d17-8c75-3c585e96a982/6454813187.pdf
    • http://bekogufepe.rf.gd/21072237632.pdf
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_f081ac3cef0b44ecb7d311ffb8e78395.pdf?index=true
    • https://s3.amazonaws.com/novipaliwid/94323543207.pdf
    • https://s3.amazonaws.com/webipejonavuv/house_floor_plan_template_printable.pdf
    • https://uploads.strikinglycdn.com/files/ebbbf1b0-6089-4db4-9ef2-4b34ddbc5e36/vexid.pdf
    • https://uploads.strikinglycdn.com/files/96827b02-e011-4f79-9e5d-d1b4251412eb/fujixuxumopemof.pdf
    • https://s3.amazonaws.com/ganubifirigevi/business_information_technology_uj_requirements.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_off0000f44a.bin
442077e6a0c5b206e2b92a3fee19593d04a21181151bc373c69b5b0426ce7f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 5648 bytes
font_01_sfnt_off00010770.bin
94b81ee2da66e15b0a54a03e3f0a56ecf786da434ef8c0f4a52ae3a83af11d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 11476 bytes

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