Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ff084c99322ee5…

MALICIOUS

PDF

76.1 KB Created: 2021-04-01 19:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c68383871da030a279773a22b92de77c SHA-1: d7e9f761eb519671fa105f1e89e49d8fa348f6d5 SHA-256: f4ff084c99322ee5794255d27762c1921042a6ca146defd58933cc535232b3dd
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a machine learning classifier and ClamAV, with high confidence. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they have won a prize or are due a large sum of money, requiring them to pay fees for delivery or processing. The embedded URL 'https://vilenefex.ru/strik?utm_term=is+sons+and+lovers+a+good+book' likely leads to the next stage of the attack, possibly a phishing page or a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/strik?utm_term=is+sons+and+lovers+a+good+book
    • https://cdn.sqhk.co/xamitarerivu/mLD5xzH/sowejufow.pdf
    • https://cdn-cms.f-static.net/uploads/4387224/normal_601b72f3b16f1.pdf
    • https://cdn.sqhk.co/vabalogu/hddlMjd/dorikow.pdf
    • https://cdn-cms.f-static.net/uploads/4487423/normal_602666c764835.pdf
    • https://cdn.sqhk.co/lewuravasu/1I7heig/wilderness_survival_guide_ad_d.pdf
    • https://cdn.sqhk.co/wazikunal/Eggjipr/tagaw.pdf
    • https://cdn.sqhk.co/powosinubuk/UQYh5ie/hack_game_demolition_derby_3.pdf
    • https://cdn-cms.f-static.net/uploads/4415292/normal_605c887663bc9.pdf
    • https://cdn-cms.f-static.net/uploads/4408866/normal_6041764300c45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zinudipir/arthritis_uk_back_pain_exercises.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/how_to_draw_a_mask_step_by_step.pdf
    • https://s3.amazonaws.com/nuxulikiwab/rpg_plot_hook_generator.pdf
    • https://s3.amazonaws.com/xasovewipeje/81020173543.pdf
    • https://s3.amazonaws.com/kabisebax/vojoredatetubiledipukilop.pdf
    • https://s3.amazonaws.com/dipafuxe/esl_family_worksheets_adults.pdf
    • https://s3.amazonaws.com/pirosisob/nolujuxovidupojovuzevoz.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/vopivilagenu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86e.bin
e39d29f627afb52e342be9608847820283a5b98259db93800b8066dfb94700a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 5192 bytes
font_01_sfnt_off0000fa2f.bin
2257abc48a6987f26b0ea66892c99032b83de7ad30ac8306cf0692122eb0b84e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 11596 bytes