Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a22d173ac88c8f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-07 10:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5f0aa8ace91a9639e57bd70eb3bdc380 SHA-1: fbfb87e45abc21261d26c39cd8cf47c6a075582a SHA-256: 57a22d173ac88c8f096410120e3ea26cddabe2627e10ffb55bfbc0bed93577bc
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain search query-like text, suggesting a lure to a fake support or download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/aws?utm_term=age+of+empires+2+cd+won%2527t+launch+windows+10 PDF link annotation
    • http://gagimubu.mywebcommunity.org/67854566916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_601288c47b0ee.pdfIn PDF document text
    • http://sethel.xyz/who_invented_the_moon_roversg93k.pdfIn PDF document text
    • http://uscarins.info/badrinath_ki_dulhania_movie_status_videoxng3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5fcd31ae9d60c.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/busilodazenuxuwegu.pdfIn PDF document text
    • http://goodshopsales.xyz/how_to_use_pentair_intelliflo_variable_speed_pumpw5g6x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajujiju/christian_worship_music.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/acting_auditions_resume_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/24550977591.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/totuximudexokakigebolix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7995cf65-6740-49dc-bdad-2dc9b52664b1/47121036105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc81b177-bfba-482c-8c1d-daee0291efe1/bowabidufevofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e4a1ff-bb80-4987-a745-455f7979593b/46697017430.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/gesovepozawoki.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/d_d_4e_artificer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/mac_pro_service_manual_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/dial_antibacterial_hand_soap_msds_sheet.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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 6012 bytes
SHA-256: 3ad039347770e60e91513babd07dfefccc29645a266c7cda1fe05f39b5423352
font_01_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 11056 bytes
SHA-256: 9d72a6f0d21b9f7d19abfada073363982e87a16943aff64846c835d376fd3ea7

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