Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd46db172ddee3c…

MALICIOUS

PDF

77.2 KB Created: 2021-03-13 23:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b89025436ac29ac293cd6257f653fdc3 SHA-1: e3361e8885c9f4aa205ac5fe6e6a00e5b7ccdf78 SHA-256: dfd46db172ddee3c2784a343ebb61f7f1ece66502ab5606de3322ec21fe6ce38
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, 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 PDF structure and embedded content suggest an attempt to disguise malicious intent.

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/strik?utm_term=what+age+is+the+magic+tree+house+books+for
    • http://lezigovedavide.getenjoyment.net/the_beautiful_and_damned_summary.pdf
    • https://cdn.sqhk.co/mevazasid/Nfjfshd/airline_commander_a_real_flight_experience_hack_apk.pdf
    • http://rumurel.mywebcommunity.org/fexekilaloz.pdf
    • http://fapasevusiledap.mygamesonline.org/45887472504.pdf
    • https://cdn.sqhk.co/zelosoza/gXhghcg/52253027286.pdf
    • http://geparup.scienceontheweb.net/kizodipiwoluteveladesazip.pdf
    • https://cdn.sqhk.co/letareximo/ghK6HVW/pool_billiards_pro_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/jejefudebuxi/nhg7Xng/large_cordless_phones_for_seniors.pdf
    • https://ribiridoxa.weebly.com/uploads/1/3/0/8/130874248/pobimij.pdf
    • https://cdn.sqhk.co/rabataxuvax/CFygdjc/20444387303.pdf
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/7296962.pdf
    • https://vemujevamari.weebly.com/uploads/1/3/1/4/131452814/a569469db5fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedojigudaj/risk_of_rain_2_rex_guide.pdf
    • https://s3.amazonaws.com/rutufokedizon/microsoft_licensing_guide_windows_server_2016.pdf
    • http://rujidafedisezu.atwebpages.com/rifimozol.pdf
    • http://xobibaga.myartsonline.com/line_6_spider_valve_mkii_hd100.pdf
    • https://s3.amazonaws.com/rewepalazamiso/25519846904.pdf
    • https://s3.amazonaws.com/bidivo/79148105663.pdf
    • http://lesidiwajenowil.myartsonline.com/61271862215.pdf
    • http://xawiwevivuzox.onlinewebshop.net/fake_medical_report.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_off0000ef07.bin
135affeaba15af62c2991ed8080de26d07bc7f690b868fda6bf464acf3587a8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 5480 bytes
font_01_sfnt_off00010194.bin
42f4a857718b32aa49a3dd11dfbcb49334739e81bcc0395c98b03cf99b0a3975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 11288 bytes

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