Malicious PDF — malware analysis report

Static analysis result for SHA-256 affb4ff4c90c41c6…

MALICIOUS

PDF

82.7 KB Created: 2021-02-13 14:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 61448b60569e55d4babc71f8334f3606 SHA-1: fbe9f125ac40c7cbe9e9925212b311f58f7db9d7 SHA-256: affb4ff4c90c41c617794d933ca9c7c1c045c0b43220615f2e529967e0697961
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of exploitation for client execution, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=sports+in+italy+august PDF link annotation
    • http://nobirejajatit.iblogger.org/rojojugik.pdfIn PDF document text
    • http://1offpark.xyz/block_craft_3d_downloadxx4c6.pdfIn PDF document text
    • http://wildboost.club/tevesalact41k.pdfIn PDF document text
    • http://kexipisibufexur.22web.org/zaveranololarodud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fd93c96cecdd.pdfIn PDF document text
    • https://pexasojurez.weebly.com/uploads/1/3/1/3/131381046/563df9ca176f4.pdfIn PDF document text
    • http://4d-5d.com/xujupolamokazin1kibb.pdfIn PDF document text
    • http://atomlinux.com/16611491235j6cze.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/geduxifusajavup-dukavojetapoji-rekamuv-gixupeketexuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/hmrc_intermediary_reporting_helpline.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/98077247664.pdfIn PDF document text
    • http://giratas.epizy.com/6399714006.pdfIn PDF document text
    • http://furovival.rf.gd/manaxamomoxifibubudipu.pdfIn PDF document text
    • http://pinezininefos.epizy.com/celsius_vs_fahrenheit_worksheet.pdfIn PDF document text
    • http://wepiliga.epizy.com/66938429515.pdfIn PDF document text
    • http://wovovaj.rf.gd/online_anti_ragging_form_ugc.pdfIn PDF document text
    • http://defixudopa.rf.gd/48051666211.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 5844 bytes
SHA-256: 564e035ca2741c4abcb3b7581b1503fb28aaaac2c333affa37341d1588be735d
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 5192 bytes
SHA-256: c3b288779282cad891e7ecabb249c57f12409b8497b9daa929840621e291a4cf
font_02_sfnt_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 11236 bytes
SHA-256: 878430ede63a1689ce42ffd7c0f56aa4a482e9b8de0ce00acd4288b80c1b9320

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