Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa872c3500d0155b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-05 03:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 508b643f206f9c40aabfb0c7b92d3187 SHA-1: 3951f060aaed23187dada929da23976e38b1e7e4 SHA-256: fa872c3500d0155b535b161ad3525ece403f060d2e7ba41d9c09ccb6f43a96f5
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. The PDF's structure and the presence of external URIs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=prevailing+wage+fringe+benefits+california PDF link annotation
    • https://cdn.sqhk.co/lilaxikixo/gqsZejg/34402425700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491175/normal_5ff7192e9b99e.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/iehehez/enemy_strike_2_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5fe199736410f.pdfIn PDF document text
    • http://rawotanu.iblogger.org/65643633698.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/what_is_a_centrally_planned_economy_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5ffa2dbc43bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6035d67fe41fb.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/xebofagunax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_601b6fee7bce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fe7059d5daac.pdfIn PDF document text
    • https://cdn.sqhk.co/xokunafuse/imFjdgg/ruses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_603a4499430db.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/salunumaxemamudasosixedok.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/integral_calculus_meaning_in_malay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bedozev.rf.gd/genopigebofe.pdfIn PDF document text
    • http://gonesipida.epizy.com/4404606672.pdfIn PDF document text
    • http://jovebaben.epizy.com/annexure_e1_hssc_self_declaration_form.pdfIn PDF document text
    • http://nuwiron.rf.gd/nugirubitosofewibisuv.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/52733611229.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 5132 bytes
SHA-256: 578596577a705351b275a4fa0ebf31d9ad7ada25c45e19fbeeef60dffd73c14f
font_01_sfnt_off0000f974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10500 bytes
SHA-256: 5bba1290e5f82bb2a8fe9ffd7ac90bfe06199b73dc08831ba1d9e6c88dd911e6
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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