Malicious PDF — malware analysis report

Static analysis result for SHA-256 072e90dc464d9b3e…

MALICIOUS

PDF

70.7 KB Created: 2021-03-10 12:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 28b930cc06af66870678dcc9e57c5fad SHA-1: ecefbe5a4a2ada9eebb0ce71cb6517fe351bff85 SHA-256: 072e90dc464d9b3e9ff22b8ba835897c37d6ff7225007e1a61bd65562c65466f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=kawaii+fast+food+drawings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fe8d3793effe.pdfIn PDF document text
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/fodizutikobanusesadu.pdfIn PDF document text
    • http://sokuzise.iblogger.org/google_analytics_sheets_add_on_sampling.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/xaresulilejiji-balabatu-xikisedo-wunixufaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_60451121c3840.pdfIn PDF document text
    • https://vabofofed.weebly.com/uploads/1/3/4/3/134337048/4780836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450154/normal_5fce4d4c5bd2a.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/xexogozasebesimunobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikilut.epizy.com/xedapitoxipogaba.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_c4087229bd5949319aad3959911c17f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/forensic_psychology_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81aa3ecf-db66-4103-bb10-c7d629aa1280/what_is_the_worst_prisons_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/ffxiii_mission_guide_5_star.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f0926d-9e45-45b0-b8c4-6bde95b7b6b2/fagawaleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae7f754-45ca-4550-8270-c849bf5e0ea7/is_tokyo_ghoul_appropriate_for_a_12_year_old.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/ben_10_alien_force_game_gba.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_79f15060e7f9408eac90bfe942645b6d.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_961c1c8173bd4d9e888978c91a8f5c38.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_ea28d4e9d92f4a529f2bf1253898553e.pdf?index=trueIn PDF document text
    • http://vakazavitin.rf.gd/how_to_get_advanced_excel_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2491685-9922-4cf7-9aae-2eea35ded0d0/jubamipelawedagivevane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea89ef7-4713-4a4f-aeef-7ffbb32ee39a/pejipurefo.pdfIn PDF document text
    • http://tevisub.rf.gd/94689442633.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_44f4e642ad964f469465c41905de835b.pdf?index=trueIn PDF document text
    • http://mufizepumu.rf.gd/jofativubufareziwidomug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 5104 bytes
SHA-256: 4afb5ffbf06d2fc9dec42a7b1650fe2c398bbaae38a4bd331855eedf1148618a
font_01_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 9912 bytes
SHA-256: bf2574d66a55df9209abcda8e4e1a300bd1e5658bfb5c49b7ca43337219055a0