Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9d2738240ba73d…

MALICIOUS

PDF

75.5 KB Created: 2021-01-18 22:19:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15dc3f4e3c64bae3afec8c5e2f3e4466 SHA-1: 6f98d252619105602eee17708dd023d0199df44c SHA-256: 7a9d2738240ba73d65f24c8fb15264863a6180fad2b9150d4c9d49f1bf39ef80
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link farm and a phishing trojan. It contains numerous embedded URLs pointing to external PDF documents hosted on disposable domains and redirector infrastructure. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://cctraff.ru/123?utm_term=teacher+scholar+model
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fcebaa57f157.pdf
    • https://xuzutewoduka.weebly.com/uploads/1/3/4/3/134364923/xifofukesoziw-nilunixi.pdf
    • https://cdn.sqhk.co/bomemenun/dijgjig/roller_ball_bearing_table.pdf
    • https://cdn.sqhk.co/pizibimo/7sjb1hb/depugalapaped.pdf
    • https://cdn.sqhk.co/libegavezu/cVQghjg/31909362178.pdf
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/zalitupufekavabev.pdf
    • https://cdn-cms.f-static.net/uploads/4393209/normal_5fbe2e403954b.pdf
    • https://tewodofupizalo.weebly.com/uploads/1/3/1/4/131452753/novuvirofemedejew.pdf
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/zasoxap-jiwimogalorepus-nuvega-jilamam.pdf
    • https://cdn-cms.f-static.net/uploads/4473359/normal_5fadf1f3c03a3.pdf
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5ff47d6037d80.pdf
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5fe097ad049be.pdf
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/35680e5.pdf
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/2322003.pdf
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fe1511395bfd.pdf
    • https://static.s123-cdn-static.com/uploads/4420761/normal_5fee690be4514.pdf
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f91fd63040d4.pdf
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/6418995.pdf
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/tatiniluxiroravewa.pdf
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/2591176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://boribasumagit.epizy.com/god_almighty_movie_free.pdf
    • http://sixanuramusasit.epizy.com/a_level_physics_practical_notes_sinhala.pdf
    • http://pozijirume.rf.gd/4482301905.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_off0000eb2f.bin
5c842fa0f96a14362aec34f34f87383b1d191b793d570a7babec91a3179e1db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 5128 bytes
font_01_sfnt_off0000fc6c.bin
7aae5b6a58b0951d1a04723ba494d07bbdde1dea42fd653ac95124788ef705a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10664 bytes

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