Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db9e61e38678e51…

MALICIOUS

PDF

92.4 KB Created: 2021-04-05 10:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e3528a6926b680b14bb7828ed21170b9 SHA-1: 6f43afd960c424f5f8b2fc894640d9704fbbedcc SHA-256: 1db9e61e38678e511c4b189ad873a507927b31a5896a33a676af1d8300ecbaee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'https://xezojetit.ru/strik'. This suggests the document is designed to redirect users to potentially malicious websites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

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
  • 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.
  • 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://xezojetit.ru/strik?utm_term=how+to+set+up+dbx+driverack+pa+plus PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5ff71b9e6e0c5.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/gjghcjB/pixel_run_cycle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_5ffc6479bca32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_603b695207857.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/cbjgUNu/pinball_flipper_full_apk_todas_las_mesas.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/0gc56ge/stellio_music_and_mp3_player_activation_code.pdfIn PDF document text
    • https://cdn.sqhk.co/jefutubup/bjfhjLk/starz_customer_service_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fd7e788bcc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5fd27c07c0f9d.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/be254097-8819-4cb6-9724-c675b85f41ba/nadavetigonuwevowar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b186a62d-cec5-41d2-9496-0fa50b281c1e/my_side_of_the_mountain_summary_chapter_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd5be9b-6b66-4fc4-85c6-329398ee772b/38040841654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd136bbc-757f-444c-83c0-ce59a4015c59/primerica_classes_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/world_mythology_donna_rosenberg_free.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_f73c374b448a4d63bd2ab5d8c32778ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/why_has_my_heating_stopped_working.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_17fb5b01030f4e29b87b30862783da26.pdf?index=trueIn 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_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 5452 bytes
SHA-256: ae07bb02320151ca8c1f1ba7ea30822ba2f9593e96961692a9375363083d3dd0
font_01_sfnt_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 13256 bytes
SHA-256: 0be4c090a0136dc9479b71e2a5adabd90b089894b164fd33d226a785c0600521

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