Malicious PDF — malware analysis report

Static analysis result for SHA-256 be977c81faffa967…

MALICIOUS

PDF

74.9 KB Created: 2021-04-20 17:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cb10de2044945bdf0bb1498b761b894d SHA-1: 59a0a61e398c6b244289781c1bdc3aabcde692a4 SHA-256: be977c81faffa967af96c265a12cba27de21049d3fa2cb0e147d42fc24ef0c47
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URIs, with one pointing to a suspicious domain 'midufefew.ru'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The presence of external URIs suggests an attempt to redirect the user to a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=are+inversion+tables+worth+it+reddit PDF link annotation
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/mukike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_602c55df20da9.pdfIn PDF document text
    • https://xowilululevala.weebly.com/uploads/1/3/4/0/134017879/3d8912.pdfIn PDF document text
    • http://pudeboreti.22web.org/zebegejoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_6024899045697.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/kidajevega.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/gjjgiic/photo_editor_app_windows_10_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_6056bc43823d2.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/6FgjQhh/webor.pdfIn PDF document text
    • http://vimoroketoburiv.22web.org/assessment_centre_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_600ec1db794ef.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/81a85614-a53f-4564-be76-15f66e2f246e/21934949982.pdfIn PDF document text
    • http://wadatexutogowig.rf.gd/neural_tube_defects_causes.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_4258ca7b1bb84744acfe58344849d0a0.pdf?index=trueIn PDF document text
    • https://8dea6f00-b35b-4e5f-9f5e-01d9eb130a9a.filesusr.com/ugd/6a8da5_951e64435dd54b85bb69cc4623788353.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac72d90-532a-4189-92ea-f73b019e4064/gadamer_truth_and_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35e3db6-8c54-49dd-8718-3dab299b7d4c/jotowegifiwotapukagepi.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_698708fb403047adbf737d4d8423bd99.pdf?index=trueIn PDF document text
    • http://voveganodamamuf.rf.gd/nespresso_delonghi_descaling_instructions.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_768ac301bc5642db8aad11db3fdf68e0.pdf?index=trueIn PDF document text
    • http://fixetofona.epizy.com/toshiba_dp5022-sd_change_name.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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 5192 bytes
SHA-256: 963c505032ccd9630e133297b2a435575b30176a37a43b8f29fce343f3d769f4
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10440 bytes
SHA-256: ad4cd53acc00e5c01997b26cf2eb35b1bd19bcbb6312effb7b15a0350f22c7ac

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