Malicious PDF — malware analysis report

Static analysis result for SHA-256 58374730c3c588e0…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 12:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a498b6ab330eca577b9585c48de2f3 SHA-1: 1954fbb62c62476bb48ab654f9910347ee17152f SHA-256: 58374730c3c588e07c9cc35d847a83db1d4d495803a5ba6c65b4579971feadf4
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a phishing lure, specifically mentioning 'invoice or payment language'. The embedded URL 'https://zajinet.ru/award?keyword=schedule+c+form+1040+pdf' further supports this, masquerading as a tax form to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=schedule+c+form+1040+pdf
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fd9bdf62b528.pdf
    • http://fruit-citrus.space/daily_math_practice_grade_5_evan_moorsz528.pdf
    • http://vazagitomis.mypressonline.com/68438526101.pdf
    • http://fallofelin.online/725821224zj48f.pdf
    • http://wersita.fun/fujesujosesesor76anm.pdf
    • http://tesubozapo.22web.org/lonusajazan.pdf
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/gabojol.pdf
    • https://dutumujupag.weebly.com/uploads/1/3/1/3/131383630/kaferabobaper.pdf
    • http://heliusdesign.ru/who_is_the_most_good_person_in_the_world_20205pyxs.pdf
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/2215376.pdf
    • https://cdn-cms.f-static.net/uploads/4409425/normal_604cf1f053860.pdf
    • http://rejamar.sportsontheweb.net/cuanto_es_1_32_en_mm.pdf
    • https://cdn-cms.f-static.net/uploads/4454672/normal_6058adfae99e0.pdf
    • http://bezerojiw.scienceontheweb.net/smoke_on_the_water_solo_tab.pdf
    • http://gokawojop.scienceontheweb.net/pittsburgh_steelers_schedule.pdf
    • http://rixorevu.getenjoyment.net/12324248475.pdf
    • http://sajiwurejedetu.sportsontheweb.net/23790532835.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wegugoleta.onlinewebshop.net/participatory_action_research_steps.pdf
    • http://kikevanalujik.rf.gd/93272775757.pdf
    • http://lamasebagosaj.rf.gd/asciidoctor_windows.pdf
    • http://jumezezufa.rf.gd/gosivifu.pdf
    • http://fufudaloxola.onlinewebshop.net/catcher_in_the_rye_chapter_22.pdf
    • http://kiwozoma.epizy.com/jamidavijeso.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e854.bin
def109ab995e7d20257d4839641a7d20748426ece991ca84b3c33f80898bf08d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 5040 bytes
font_01_sfnt_off0000f973.bin
7ac55931a07264cbe9feb7f7dbf6d9a1dedbce6d227be210de7bbdc05e5f3fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10728 bytes
font_02_sfnt_off00011e07.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E07 4324 bytes

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