Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc3761732a37b98…

MALICIOUS

PDF

74.1 KB Created: 2021-06-08 09:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2e5bc762bf8fdef35f86b7f83bc5ef01 SHA-1: d06dbd6a2ab9b94a0554e11dee79b07805c53abb SHA-256: 9bc3761732a37b98455fc89fa6146fd87fab2cbf47eda95293eec068a70ef699
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The primary attack pattern involves directing users to a large number of external sites, likely for malicious redirection or phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://laborke.ru/pbw?utm_term=nutrient+value+of+pickled+beets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415052/normal_604831e15bfe2.pdfIn PDF document text
    • https://sajakuzotile.weebly.com/uploads/1/3/1/0/131071181/kipewesujazito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_60445d1783ed3.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/bepakixivazo_dojutatov_jixojikejefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_600ce508547ff.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/bafa94ea-f806-4a66-93b9-e54ba80f55e8/how_to_calculate_months_in_excel_using_two_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a015dc4-6d33-49f5-894e-1ae37d9ddbce/28514419624.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/how_to_write_a_authorisation_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8775fb-745b-430c-b097-4f02cf795b18/zabumibiwidowobozuboju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f3231b-2370-442f-b341-3a9bd24c67ca/5508974981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f73e2f-1ff1-4536-9906-f059c66e2db0/expert_grill_digital_grilling_thermometer_replacement_probe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1152e58e-2aae-41dd-b869-8cdf284257e3/north_carolina_dmv_learners_permit.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/bigedapejimuxoputo.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/exercices_sur_ladverbe_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66febbf-9d9c-494b-9924-7c6383ac98e5/2980351913.pdfIn PDF document text
    • http://gegoxelaw.pbworks.com/f/28504738330.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/f/example_of_ethnographic_research_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601af511-87f5-4328-a386-32dd7a5469eb/attack_on_titan_game_free_download_offline.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144789960/free_fire_hack_download_mod_apk_2020.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144412836/how_to_find_a_missing_angle_in_an_irregular_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3da83a1-e3e0-40cd-a33b-c3b30b349e0a/55479981852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc6fd50-0d25-4163-91ee-0664ab66c2ec/75522329468.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 5380 bytes
SHA-256: 2277255c824615989247b3c16660984a8aca90a7be570ad4f78361ff1165ee9f
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 10692 bytes
SHA-256: 9e04f810b60ad03cb13bd59c1a7b542f617eac4f5fdff8e6d2f4f70277d9d890