Malicious PDF — malware analysis report

Static analysis result for SHA-256 899908fa037fc3f6…

MALICIOUS

PDF

79.3 KB Created: 2021-06-01 20:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254779c1951df2ba4c0396f7d607b7d7 SHA-1: 2cc4a7c31101851a36e76cd76e3b5d04a102d274 SHA-256: 899908fa037fc3f6ffb7b98f51dff3dfed048618def2cf65be41ee2ebd5d9098
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are to SEO-optimized PDF documents, suggesting a link farm or content stuffing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/pbw?utm_term=how+to+get+garageband+on+windows+10
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fcc5de8c9949.pdf
    • https://zagozejidenadap.weebly.com/uploads/1/3/1/4/131407028/vexilugiv.pdf
    • https://cdn-cms.f-static.net/uploads/4411915/normal_60644dad88ec5.pdf
    • https://bizokotipalan.weebly.com/uploads/1/3/4/7/134771030/kusewomaluwu.pdf
    • https://cdn-cms.f-static.net/uploads/4418184/normal_6067da7884e30.pdf
    • https://static.s123-cdn-static.com/uploads/4464852/normal_5ffac43314a09.pdf
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/1295580.pdf
    • https://cdn-cms.f-static.net/uploads/4373264/normal_602ef370beb99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6dbbf37-f716-417c-baf8-44459260344e/resumen_del_libro_continuidad_de_los_parques_julio_cortazar.pdf
    • https://uploads.strikinglycdn.com/files/90a9f1c2-efa4-4872-83fb-dd10cac34ae5/tupigatavoretokasazakago.pdf
    • https://uploads.strikinglycdn.com/files/a4105d97-1160-42e2-b5b9-4bfca527be5a/citizen_chronograph_wr100_manual.pdf
    • https://uploads.strikinglycdn.com/files/e0425cb5-5aa9-4244-9ccb-0b50c29d3ba6/72965579274.pdf
    • https://uploads.strikinglycdn.com/files/ec6df3e4-2c02-4372-a598-2fd5a6d796e2/active_and_passive_voice_worksheet_6th_grade.pdf
    • https://uploads.strikinglycdn.com/files/62e95e8c-f684-4650-920b-ef90a135ac37/zudexiketipawebozoxovokok.pdf
    • https://uploads.strikinglycdn.com/files/e2d1fc25-10da-48d2-8ab0-b68c9444c0c6/94506684620.pdf
    • https://uploads.strikinglycdn.com/files/59a5494d-4431-4658-b05f-ed7df510ac60/gotapibixoxawijo.pdf
    • https://uploads.strikinglycdn.com/files/f7f296ca-c291-4a5e-91ec-e65ecd4a8aa9/drawing_involute_gear_teeth_in_solidworks.pdf
    • https://uploads.strikinglycdn.com/files/898f4ea4-7904-427f-9a57-8dee174e81ce/how_to_program_a_digital_tv_converter_box.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_off0000f716.bin
5bf698c963ed7a2bd696200fc5dd5ba745fd0555e3481c939a7453c95040c3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 5348 bytes
font_01_sfnt_off00010965.bin
7b37904893a784f2978726d956a6292679561cb3c890de93b95d473496faf519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 10824 bytes

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