Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ceb76b300c523bd…

MALICIOUS

PDF

78.8 KB Created: 2021-03-25 10:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b12724e5229c1a22a6cbc9fef14df62a SHA-1: cacc7a6682fa9cbe8626d39914b1dffae1706d76 SHA-256: 7ceb76b300c523bd542c243ab2ded6aaa79bc5b6f41dd088b885a31f11dfc992
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://dugedepap.ru/123?utm_term=alister+mcgrath+christian+theology+an+introduction+pdf PDF link annotation
    • https://wulejowaru.weebly.com/uploads/1/3/4/8/134886315/zukasazitofazalit.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/vimekemale.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/1488466.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/sowobawanofit_dupirubutek.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/fogenopaxeluz.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/gitesiwupagarikovam.pdfIn PDF document text
    • https://fogiboxumejak.weebly.com/uploads/1/3/4/5/134518377/vubojozi.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/pirezizimuxizekojir.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/3303512.pdfIn PDF document text
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/1162097.pdfIn PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/2311388.pdfIn PDF document text
    • http://xitaboketeloba.iblogger.org/zaxarefuduko.pdfIn PDF document text
    • https://resigigemi.weebly.com/uploads/1/3/5/3/135326159/3228266.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/britax_marathon_clicktight_forward_facing_height_limit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxufazekez.atwebpages.com/what_does_a_descriptive_statistics_table_show.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_6f6595066bf04e3db699b72f12fd6705.pdf?index=trueIn PDF document text
    • http://tafiwepamubov.atwebpages.com/98784051743.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_0b4e532e1ae3488b9a1c61d2cdb0fb99.pdf?index=trueIn PDF document text
    • http://wogurep.epizy.com/ejemplo_de_estrofa_copla_de_arte_mayor.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_33d830a092814f7b90921ad058aa7df1.pdf?index=trueIn PDF document text
    • http://bejawuxinekaz.epizy.com/kenmore_front_load_washer_troubleshooting_guide.pdfIn PDF document text
    • http://wuxizajepasuwu.epizy.com/cmc_entrance_exam_question_papers.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/jeep_cherokee_limited_2015_manual.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/90496917778.pdfIn PDF document text
    • https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_1fb0d4c24f1942b0a88273175f3d0947.pdf?index=trueIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_e4878ce2722e4c90b3d3a8bd1dfb13a0.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_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 5660 bytes
SHA-256: 99ff0203cb5706b5ed89c4d388f3641b89c6f4b1a8b96363957654b1ffe38209
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 10624 bytes
SHA-256: 1b0cce8c935eedfc1178f5a2d9001fc4a28b12bc0d454093f2c8edf50bba530e