Malicious PDF — malware analysis report

Static analysis result for SHA-256 87412333468bff3e…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 01:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 508bcf5e9a1f6e7744b7e78a7d5d0967 SHA-1: 843ab81d39d343aca03488f6f39b5d7262582bc7 SHA-256: 87412333468bff3eebe67e6c2c2863302f352bd8febe3a79bd6c535ce9385567
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=laser+guide+rod+review
    • https://cdn-cms.f-static.net/uploads/4403804/normal_604f2ec0dc6b1.pdf
    • https://cdn.sqhk.co/zofagopipowi/cTSygjd/modern_heavy_duty_tractor_farming_simulator_3ds.pdf
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5ff768c88792e.pdf
    • http://negedibomul.sportsontheweb.net/farisevemuguwesalubizu.pdf
    • http://duwinijuj.mypressonline.com/kajuxufizadukinavigesafan.pdf
    • https://cdn.sqhk.co/pigevikuwi/iOSXjbl/best_soccer_manager_games_ios.pdf
    • http://healthyforczechrepublic.site/information_report_sampleuhxaq.pdf
    • http://maykistore.ru/xulamimonugu1a9n3.pdf
    • http://uorott.com/matukatsluaa.pdf
    • http://coolvdomaion.online/437941241034f5wz.pdf
    • https://cdn-cms.f-static.net/uploads/4483082/normal_602687c8bc865.pdf
    • http://muxoman.mygamesonline.org/ratovilifisojatubufuza.pdf
    • http://juzufezike.mygamesonline.org/kisumojebinepep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tixedujegibex/83269938426.pdf
    • https://s3.amazonaws.com/tunenijexe/68002545267.pdf
    • https://uploads.strikinglycdn.com/files/23a9298e-7175-4d37-8b09-541b794c895d/14693050845.pdf
    • https://uploads.strikinglycdn.com/files/120716a0-59f2-4262-a818-33fbe12896f0/45789117620.pdf
    • https://uploads.strikinglycdn.com/files/9f3ff48b-48f1-4a5e-857d-06dad7baf673/ubee_modem_dvw32cb_wifi_password.pdf
    • http://bamonoxo.onlinewebshop.net/davexawamejilupojogixavud.pdf
    • https://uploads.strikinglycdn.com/files/d5988d68-28c2-46dc-933f-9f0c8b15d875/tp_link_n750_access_point.pdf
    • https://s3.amazonaws.com/zufojadibi/wolup.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_off0000ee66.bin
6db2a55e759721dd53fb51055890954df8fe3ff0f5b29d84f1c27df74b68d49b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 5052 bytes
font_01_sfnt_off0000ffbb.bin
f03aca68579e6a95f44199c1d2b11a541fc97f95a7846283055f123006c37a39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10416 bytes

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