Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4af66fc3b802c9…

MALICIOUS

PDF

82.9 KB Created: 2021-03-18 00:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eaeff2df55177f8d52e8336b615ee013 SHA-1: 8d9800bb3ea9d5cda19a572833e34783737b5a95 SHA-256: 2c4af66fc3b802c9c8657cc3afaf1d7bc4593110f06ef903b01494a31ecdf207
186 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 disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=boss+es+5+4+cable+method PDF link annotation
    • http://hookup157.fun/radizatasz0ka3.pdfIn PDF document text
    • http://world-wild-shop.com/96606362758ifg8k.pdfIn PDF document text
    • http://bit7.top/55130113597wf9w1.pdfIn PDF document text
    • http://the-glow.ru/gajiwasumilawlvyy3.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/wow_fury_warrior_guide_8._2ap6je.pdfIn PDF document text
    • http://petersikdar.com/tidusodasi5uukh.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/c1108584-12dc-4b37-a17e-e2056adac9b4/kariludosigofinakolavafas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2d07b5-55ae-4bc6-a1d7-eb2aff9ba9b3/koziwazexutotanulugiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3503a233-dff8-48bb-9264-c6163195e8dc/nubuzuvar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d0c721-78fa-4770-aec4-fbb683dcb8a3/vitamix_e320_accessories_uk.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_b37fd42d8e4746948b8d2b0fa9508a02.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_3b132ac4372745ffb435e6c1a0f25580.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_050887bf674f48bc87509eb3fc42b29b.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_4a02b4281632432b9718557ac5763fb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad3ca28-6f80-4d77-9295-1b6d120d2e5d/what_is_the_traditional_music_of_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb61bf0-09f6-4f0e-82c4-83099d9d57ae/how_to_get_to_firmament_ffxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037124de-d89a-47d2-8949-120094ba14e7/how_to_type_hat_in_word.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_3838bb3bd3ba43f392579fbe69519423.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_aaf8a98c9d5046f5b5224b136c11a375.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 5484 bytes
SHA-256: 9a96b2ae83321136a8a12fb3d8d6cd3b46f1a312b9e6966ec1b5a02217e93523
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 11224 bytes
SHA-256: 01881fb15fe942d73e723ac4dc4e03341354266ef511d05dbca99119abbe9a9b