Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b766989bf9a250…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 09:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40fa3a4b3bde1b2e1ceebe7733c80e43 SHA-1: 03b742d2e19fe5b18eea2861f0de6481429e8884 SHA-256: 32b766989bf9a250d0640bb5551fa2b26d153ef9bbea1af0357c88a7f771bd2f
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-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://infrive.ru/pbw?utm_term=how+to+get+desktop+version+of+facebook+on+phone
    • https://wizujepubenepax.weebly.com/uploads/1/3/5/3/135317151/9908070.pdf
    • https://cdn-cms.f-static.net/uploads/4488558/normal_602b2588c513e.pdf
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/afb165697b7.pdf
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5ffc9dcc891ec.pdf
    • https://falibapop.weebly.com/uploads/1/3/3/9/133997194/9172946.pdf
    • https://cdn-cms.f-static.net/uploads/4404959/normal_604a13de3fec8.pdf
    • https://govubazidexifa.weebly.com/uploads/1/3/4/3/134342639/kenekiwipiz.pdf
    • https://cdn-cms.f-static.net/uploads/4491926/normal_6018677854f30.pdf
    • https://cdn-cms.f-static.net/uploads/4403672/normal_602288a59c0ac.pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_6068a03406bc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c327c27-9b31-4026-98ce-a2a7a65d03df/standard_painting_canvas_sizes.pdf
    • http://watusuxipidu.pbworks.com/f/smeg_coffee_machine_instruction_manual.pdf
    • https://uploads.strikinglycdn.com/files/8d0d3a75-c903-42cd-a905-9d03b015fd29/blank_world_map_with_countries.pdf
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144485379/beach_buggy_blitz_mod_apk_happymod.pdf
    • https://uploads.strikinglycdn.com/files/20f924d4-18f5-4cc6-bc34-99bad657a9f2/jbl_flip_5_stereo_mode_review.pdf
    • https://uploads.strikinglycdn.com/files/8b3d80e6-b5fa-42d6-9a10-1825aafcb6de/advanced_excel_functions_for_statistics_and_data_analysis.pdf
    • http://lifuzopa.pbworks.com/w/file/fetch/144667278/kiss_him_not_me_movie_eng_sub_dramacool.pdf
    • https://uploads.strikinglycdn.com/files/b7616a26-5fd2-4d71-a837-e2e6bc7d7c59/victorias_secret_employee_handbook.pdf
    • https://uploads.strikinglycdn.com/files/9c70d72c-0b00-47d7-8bf4-63e79255f242/95072152847.pdf
    • https://uploads.strikinglycdn.com/files/6f3092a0-3ab6-4aaa-a9c3-48846498ad9c/avery_weigh_tronix_fairmont_mn.pdf
    • https://uploads.strikinglycdn.com/files/b64c73fb-f7f8-488d-874a-07a931d80397/37410290391.pdf
    • https://uploads.strikinglycdn.com/files/b5cab4f1-4795-4422-826b-18103f74e59e/bogogixevewo.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_off0000e4a7.bin
6ace2735ec078a2c116bc0134426257462db23e85b2945811f433c814c346866		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 5700 bytes
font_01_sfnt_off0000f823.bin
3729195ff23a821d4337fe852389c8fd7d1bd47ade0d9302bf988abc8273ed0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10620 bytes

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