Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b79fb32748af056…

MALICIOUS

PDF

65.7 KB Created: 2021-03-05 07:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81dc81ebcd338b7920ac07a5bda1530f SHA-1: 34cd31f5dd13d7458b8af2b73c4c789fc3d09320 SHA-256: 7b79fb32748af056649e8ef5db61bde437d8fb3d17d852b1124be4b7b3078afb
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of 'utm_term_redirector=True' and the suspicious nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=timothy+zahn+thrawn+books+in+order PDF link annotation
    • https://cdn.sqhk.co/vimewiki/Uhfhcjh/zetivuliketitalogugafenod.pdfIn PDF document text
    • https://vosafezedivoko.weebly.com/uploads/1/3/6/0/136095507/e3309f974b.pdfIn PDF document text
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/9e95099861cc76b.pdfIn PDF document text
    • http://particulieres-societegenerale.best/blackberry_q10_android_autob1kvd.pdfIn PDF document text
    • http://qiwi-wallet.online/71189525352l3kf9.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/6366056.pdfIn PDF document text
    • http://xozonline.ru/online_rent_agreement_punek4lhn.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/EQha8ha/gun_range_lakewood_nj.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/pakezumix.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/Shfjijf/toolbox_for_truck_lowes.pdfIn PDF document text
    • http://1xbet-registr.site/linear_regression_practice_problems_with_answersoazf5.pdfIn PDF document text
    • http://salet.store/diserorogilunedim9u7o.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/xajazularixi.pdfIn PDF document text
    • http://good-production17.site/panegyric_poetryix1ju.pdfIn PDF document text
    • http://liketime.online/revetemaacd.pdfIn PDF document text
    • https://kibibobufusasi.weebly.com/uploads/1/3/4/6/134643218/sajufezes.pdfIn PDF document text
    • http://socialwave.me/nupolae6yw8.pdfIn PDF document text
    • http://techanomic.com/plague_inc_scenario_creator_apk_modf8ci6.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/ce62dece-74b5-4a74-9df4-0d59ffae99e3/67458792935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4e3c5e-4852-4f47-a27d-840c3ad18d26/bexibonobewazuvex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa59aa6d-998b-4ea9-95de-ad8f9a8ac7ac/itil_v3_foundation_certification_badge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69ee6a5-df2e-4032-afec-66c778c3c1ec/567964308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff04fb6-af53-45d3-bca4-cdf4d46d622e/wumimetimujitelibijenuxi.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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 5428 bytes
SHA-256: 34b83bc78af949d373a3957e3c6dd471a40556bc15251130c461b6f6af3fc41f
font_01_sfnt_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 9264 bytes
SHA-256: 380bc8dd949d176e902bb168a0cc25c538fbc88b800a4ca4b071dbbd0a1ba1f1

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