Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efaa9a2280a0332…

MALICIOUS

PDF

74.2 KB Created: 2021-03-09 02:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7937c8b99578665f819baaff3962789b SHA-1: 2168a6ec74a53a6bcce8c4712e6afe6e9dbed8df SHA-256: 4efaa9a2280a033247055c70ed845b6331a94c186d78bd8445bcaba2421f1e9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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://nipisod.ru/wix?keyword=what+is+system+analysis+and+design+in+computer+science PDF link annotation
    • https://cdn.sqhk.co/tuvameboroke/hjYibgj/kanosivug.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/4688148.pdfIn PDF document text
    • https://cdn.sqhk.co/jozopotuwomo/cmfig0M/46914631695.pdfIn PDF document text
    • http://brumbum6.xyz/debiwujitejoxunutovefetal4a5k.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/zHDjaVj/38446593193.pdfIn PDF document text
    • http://bakofutemuxasog.iblogger.org/wahl_clipper_color_pro_cordless.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/numark_ttusb_review.pdfIn PDF document text
    • http://sobakin.space/ez_go_golf_cart_electric_motor_diagram9915x.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/1207141.pdfIn PDF document text
    • http://dkblogin-de.best/jofedez3hv34.pdfIn PDF document text
    • http://wei-nmvc.com/vunezegasawusaboq4g81.pdfIn PDF document text
    • http://idealslimitaly-official.site/murawalhjzns.pdfIn PDF document text
    • http://vogeposekuxav.66ghz.com/6429052036.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/iaifUif/traffic_rider_download_android.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/lugavodukilodido.pdfIn PDF document text
    • https://dilomosef.weebly.com/uploads/1/3/4/3/134316650/811147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzuxutetug.atwebpages.com/how_to_make_1024x768_stretched_look_better.pdfIn PDF document text
    • http://dijazulebok.epizy.com/zijej.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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5600 bytes
SHA-256: 2502b63be66f3847b4d3c0119ddc293f0f31e285327f659d6938f086bae9e090
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 10412 bytes
SHA-256: a632e6097582378ab51738d7ccce0391bceeceeb3ff0815b9c65144e12175868

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