Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02aeb6aaf28e0dd…

MALICIOUS

PDF

78.4 KB Created: 2021-05-21 00:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 95d487502ca7ca3b28dddc50c66fbf7d SHA-1: 9fadd93690f6ce02e02c11d5a726485b13dfa593 SHA-256: a02aeb6aaf28e0dd8ad531555187b606122d30f7b6e6fa0e9129df228afa1b57
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML classification and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of a URL in the document body, combined with the link farm heuristic, suggests the primary goal is to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=certified+information+systems+auditor+jobs+in+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448556/normal_6029aa9deb706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_5fd31715b64b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_60472b77444ff.pdfIn PDF document text
    • https://vapojulugib.weebly.com/uploads/1/3/4/6/134669528/5964719.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/6982494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_60188b39d8c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_60695f3c177a3.pdfIn PDF document text
    • https://wasoxojeroxinab.weebly.com/uploads/1/3/4/8/134888233/polisidunux_lelazop_zisofa_sevineb.pdfIn PDF document text
    • https://kabixiwuvilaz.weebly.com/uploads/1/3/2/6/132681231/futozimunuli-xutivakabunef-maxaw-zaxesem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5ff7d51ccdaa0.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/62dfa6479d2.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/380ad5a96622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_60651145b6e9a.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/tonifigivavavigif.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/guremo_wunasijaziba.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/6eb8d.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/175a0772-5e46-4003-9637-b6c3b2967c57/pajoronijelixifabozujasow.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/computer_hardware_servicing_curriculum_guide_grade_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a6de8f-a598-4224-b65f-88f3b7153f95/unearthed_arcana_ranger_class_feature_variants.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/how_to_improve_ruger_sr22.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/vurutidodojogijepodiziti.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/vokojevumagedod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cec9920-ad7e-47c4-a700-bd41689267ea/associated_press_stylebook_and_libel_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/oblivion_reloaded_ini_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce97bed-7f4e-45fe-8443-4e53dab2f1ff/velo_elliptique_nordictrack_act_commercial_7.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_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 5356 bytes
SHA-256: ac4983d1669701149e6e8a5b9e558914eb95ee0d1fc19649b982b7288d4db9e9
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 11668 bytes
SHA-256: 1400efee34009c33d4d1f707606c4cbd71bd8b64e27de657dd526f39e4f20c24