Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13bd337482b2b5e…

MALICIOUS

PDF

79.4 KB Created: 2021-06-09 07:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f938a600a41d16dcac136627116131c SHA-1: edf126e18ca579aea3e10ebae9aa8c703f9f3603 SHA-256: b13bd337482b2b5e98bf35c9e0f605f412940b209c5583725766728874e29b80
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a URL associated with movie streaming. This, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=white+chicks+full+movie+123movies
    • https://cdn-cms.f-static.net/uploads/4446497/normal_601dd934c1678.pdf
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5fee68197c804.pdf
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/3fc959.pdf
    • https://static.s123-cdn-static.com/uploads/4417648/normal_5fe55db765612.pdf
    • https://ropejanetim.weebly.com/uploads/1/3/4/6/134600341/4b8978.pdf
    • https://menedusuwoguv.weebly.com/uploads/1/3/4/6/134699995/4544805.pdf
    • https://zesujejiviwi.weebly.com/uploads/1/3/4/7/134729849/30a62148d56f7.pdf
    • https://cdn-cms.f-static.net/uploads/4490121/normal_6031879573419.pdf
    • https://motadonikedubi.weebly.com/uploads/1/3/1/8/131856170/filopuvugoru_supuvipuluwixu_jekeduxewola_piselujaxemanu.pdf
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/nopek_famax_wipakopojufe_xefokimas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f221ccd2-d78b-41f8-983d-5c01e4a53ba3/why_is_my_hp_deskjet_2600_not_printing.pdf
    • http://doxawadar.pbworks.com/f/english_grammar_exercise_free_download.pdf
    • http://kimotamiju.pbworks.com/f/daganije.pdf
    • https://uploads.strikinglycdn.com/files/e1d88825-21c5-4ed0-8c09-41f3bd19b682/what_is_ch_05_error_in_lg_ac.pdf
    • http://joxupakager.pbworks.com/f/20820733505.pdf
    • https://uploads.strikinglycdn.com/files/9956c01c-f3b3-444f-bf3f-fb88b49e7383/jirifulido.pdf
    • http://gudotoxej.pbworks.com/f/reddit_nba_streams_down.pdf
    • https://uploads.strikinglycdn.com/files/62cf444c-68a4-453a-a901-842e961c9e16/what_is_the_magnitude_of_the_force_of_friction_acting_on_the_block.pdf
    • https://uploads.strikinglycdn.com/files/7f77f07c-093a-4044-bf67-6bdfb2c3292e/dish_network_vip722k_manual.pdf
    • https://uploads.strikinglycdn.com/files/0bd9752a-a2f8-4299-bd64-b36cc8d49878/revit_2020_api_developer_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin
266824f1d423c0a20278cb5a28c9b50b0d86a45b4d5822103f185c1c445bdbfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5076 bytes
font_01_sfnt_off0000fcb1.bin
ec00a8f15df4ebd024c7b08f00ba830079cd4c1c47782edd1dda34922fd8883e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 11048 bytes
font_02_sfnt_off00012249.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 4324 bytes

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