Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd58f11692356f83…

MALICIOUS

PDF

80.1 KB Created: 2021-05-01 02:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02985eb70088cdd71d1bd30a74fd9476 SHA-1: ddb7dcdb0d0c7bcace501db5aafe87a9ff9f3cf7 SHA-256: fd58f11692356f83e1c47a58406bdc47db5b2607712dfb40caa7b9513d09002c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

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://resalured.ru/strik?utm_term=how+much+does+an+officer+in+the+coast+guard+make
    • https://cdn-cms.f-static.net/uploads/4461777/normal_6068fb5544893.pdf
    • http://xuribof.medianewsonline.com/church_quarterly_report.pdf
    • http://damvglaz2.xyz/what_is_on_your_mind_facebook_quotesdazam.pdf
    • http://kernig.store/rutinukofepiw5rcx8.pdf
    • https://cdn.sqhk.co/vibisidumes/jPShhgf/bitobu.pdf
    • https://static.s123-cdn-static.com/uploads/4377408/normal_5ff550278a26d.pdf
    • http://moderivapotilos.22web.org/tuvidivenirunivipof.pdf
    • https://static.s123-cdn-static.com/uploads/4454809/normal_5fca5b184801c.pdf
    • https://cdn.sqhk.co/jiguluzufuwa/ieIjfNr/training_department_administrative_assistant_job_description.pdf
    • https://cdn-cms.f-static.net/uploads/4450256/normal_603f287227237.pdf
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5fee8331e0db7.pdf
    • https://cdn.sqhk.co/kagurase/03jhmv9/playstation_store_refund_email.pdf
    • http://pedujagafena.22web.org/lenzing_group_annual_report.pdf
    • http://4bochki.ru/leadership_theory_and_practicekdkzp.pdf
    • http://sebamusimuduj.iblogger.org/62378964530.pdf
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5fdf25bd0baf1.pdf
    • https://cdn-cms.f-static.net/uploads/4366408/normal_602af35ca4c18.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://cdn.sqhk.co/gogojelawov/ucdichh/swift_car_shocker_price.pdf
    • https://cdn-cms.f-static.net/uploads/4387581/normal_604999c5edb52.pdf
    • https://cdn.sqhk.co/jogowijalaro/9gdjVs9/65673428412.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sitikaf.epizy.com/limaxiri.pdf
    • http://japinoxizidunub.myartsonline.com/nizideriz.pdf
    • http://zivonupawidam.atwebpages.com/22440095608.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_off0000f8e2.bin
5058e141c3280acf3d1c3f151b840e48af77cf1747c3bc0f82dcf7c1c76fb9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 5520 bytes
font_01_sfnt_off00010b8d.bin
80ce095a46d6fd89c1ec235490165bf0f1e1421c8ab5140941363e96ca1ccfd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10908 bytes

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