Malicious PDF — malware analysis report

Static analysis result for SHA-256 159a4079a6451eb0…

MALICIOUS

PDF

84.1 KB Created: 2021-05-20 10:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f7073660ce7ac3a98b6025e683b51bf0 SHA-1: 25056a60b2e6a119cbc260e1b41973ebfa32953c SHA-256: 159a4079a6451eb0240c13d39a6077e00c13f4f52b08aebcea6b880e46c66649
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to coordinate transformation, indicating a targeted approach.

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/strik?utm_term=transformacion+de+coordenadas+utm+a+topograficas+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417141/normal_600003eee0898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5feb0cc0d0e98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495696/normal_60055cd594da4.pdfIn PDF document text
    • https://puzesijokivokef.weebly.com/uploads/1/3/4/3/134312217/12c394aa8538c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_6035b244322ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_602694fd27c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_6031baec73cf1.pdfIn PDF document text
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/3bc08f41adca1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fcb4c132d963.pdfIn PDF document text
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/b82b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_60586036d051f.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/folexapurilowe/pixisexapebewumujukokonaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/zmodo_camera_wont_connect_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3100d5df-1593-473e-acd9-447db9c3d173/how_god_changes_your_brain_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/old_agneepath_song_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ca8ce0-468a-4d57-a337-c33d6ccfe941/e_kitap_oku_cretsiz_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e4ba79-980b-44c4-851a-eeb459698d3c/how_to_make_a_lettering_brush_on_procreate.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/desududo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06e075d-6bf0-4b13-a5e3-ca765876aea9/how_to_put_on_3m_scotchcal_film.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_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 5492 bytes
SHA-256: 3a0dc847f5eb17fcf5eee7383f337dc278bdf73c9e45561e61735d5eb64f4ce1
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 12960 bytes
SHA-256: d8542749ec01f41d66c897ac5d6eb872fdb1767753ad5c909cc45bf18b45da0e

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