Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87de4f0de12cb5f…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 08:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d840a1e49344cc26fc0dfca92469e7c6 SHA-1: c9c87c9f31d05f68f36096877519aec3efd50165 SHA-256: d87de4f0de12cb5f3e76276169e2cebce7f5ea68bd6cbb7cf31eca131bd3c91f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external URLs, with one specifically linked to a 'link farm' heuristic, suggesting an attempt to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to 'Dvt management guidelines' and the authoring application, which is likely used to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=dvt+management+guidelines+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ff65eb83f8b3.pdfIn PDF document text
    • http://sale50.pro/rascal_scooter_partsumvke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_603aeb9b1e827.pdfIn PDF document text
    • http://tiktokhd.design/how_do_i_get_google_maps_to_work_on_my_iphonehyc7x.pdfIn PDF document text
    • http://pasevomufarezo.22web.org/anteversion_femoral_en_nios.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/zubesubabed.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/mivavapesipakasegadi.pdfIn PDF document text
    • http://sinomefonok.mywebcommunity.org/74889105784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5ffb7193d231d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_60184ed1e91cd.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/vasitawoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5feb7e2c682bc.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/59619168219.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
    • http://tobidogajetu.onlinewebshop.net/26835743440.pdfIn PDF document text
    • http://xolemobubusosi.rf.gd/bijifefemasumuvididafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b888d1ee-350d-4821-8f1d-f7e6db741722/65473592792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa57b6af-814f-48e0-a49b-3159028998d8/maytag_neptune_dryer_parts_manual.pdfIn PDF document text
    • http://sadoboxijowem.myartsonline.com/sbr_sewage_treatment_plant.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/tutorial_for_python_beginners.pdfIn PDF document text
    • http://mogesitulug.rf.gd/books_on_apostolic_ministry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288bd236-3658-4602-81b3-44c73ce5cdb9/how_do_you_reset_the_security_code_on_a_moultrie_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74a72d3-5b4e-4834-a52a-2b5b532af0e7/43098918249.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 5096 bytes
SHA-256: 19f48056c247c3678b307ae5955de1838dc289a7e2e7e62b381d9b38ada444c8
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 11196 bytes
SHA-256: 9aeb619ff5e41557f2b97b54e0321c50e9eb41088917cb5be8d1c2ca9f460708
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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