Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e56dc1cfcdc37d…

MALICIOUS

PDF

73.2 KB Created: 2021-02-18 07:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a7252b70825a1f87ca4c8ef70e3a595f SHA-1: ea29adc14455540c470cb492ddf014e12f312f0f SHA-256: 97e56dc1cfcdc37d29df0d882155bd20f6275e249163dc7334c93afaab93f6a8
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to a site offering a 'free download' of a textbook, a common lure for phishing attacks. The presence of external URIs and link farm heuristics further supports a malicious intent to redirect users to potentially harmful content.

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://leonvi.ru/strik?utm_term=gardner%2527s+art+through+the+ages+16th+edition+pdf+free+download PDF link annotation
    • http://ruszaimclub.ru/chasing_cars_piano_sheet_musicvg1f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_60102176c3639.pdfIn PDF document text
    • http://bloomwithdeanna.com/495350106774hgo8.pdfIn PDF document text
    • https://rokumipizo.weebly.com/uploads/1/3/0/7/130776068/4fd98a3a.pdfIn PDF document text
    • http://xufunuduxatene.iblogger.org/centos_6_64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408176/normal_5ff53901c61b9.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/c005f69a2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_6018ada72e3d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_601b3ebde19fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fca7ddfef533.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/zemozarimafugusija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffbad7cce384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://denefarow.rf.gd/honeywell_vision_pro_8000_thermostat_th8321r1001_manual.pdfIn PDF document text
    • http://xadamun.epizy.com/movies_links_telugu.pdfIn PDF document text
    • http://funizenobuwuka.epizy.com/99050545062.pdfIn PDF document text
    • http://kuwokezolofe.epizy.com/flight_simulator_ipad_free.pdfIn PDF document text
    • http://rokabimokow.rf.gd/interesting_powerpoint_templates_free.pdfIn PDF document text
    • http://fixiwerasame.rf.gd/ardaas_karaan_happy_raikoti_ringtone.pdfIn PDF document text
    • http://xefivaz.epizy.com/bobitotuxe.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_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 4484 bytes
SHA-256: 204eff234683c83c940adc29b0799840f196e18d51f90d93afe707080363192f
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 5664 bytes
SHA-256: e7cabd6fd9cb5feae1e7b3b82c513c8ef6101ad425b2579e9f289666496de46b
font_02_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 10800 bytes
SHA-256: b982dffb7e51095409264e386187367d4c6f6d434ffcbff24b9a0c6a20c7efff

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