Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fc8a2a6304e793…

MALICIOUS

PDF

71.9 KB Created: 2021-02-25 22:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: afc6f01d85486ea76edb5261c17808e2 SHA-1: bf6b9d8974b8d2d4b84c36368c21a676f23c5da2 SHA-256: b3fc8a2a6304e7939c592b464e38871bb6c7ceb55fb555f92d780e236fd42da5
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to interview questions, designed to trick users into clicking malicious links.

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://jacksth.ru/123?utm_term=problem+solving+interview+questions+and+sample+answers PDF link annotation
    • http://hotsales-com.xyz/musicals_near_me_2021jv8rp.pdfIn PDF document text
    • http://idealicaitaly.site/845886972288tzhv.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/parental_authority_questionnaire_meaning.pdfIn PDF document text
    • http://povar2020.site/6365305700806br7.pdfIn PDF document text
    • http://7lessons.site/36022822642sqqfz.pdfIn PDF document text
    • http://kesenirevapovid.iblogger.org/netflix_for_smart_tv_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofopok.epizy.com/how_many_weight_watcher_points_in_granola_bar.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/bixurakiborineza.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/59844696866.pdfIn PDF document text
    • http://kagomovibinat.rf.gd/7592677027.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/food_safety_net_services_phoenix_az.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/jaxonov.pdfIn PDF document text
    • http://totaraxidob.rf.gd/lalozibodokuxizovesazo.pdfIn PDF document text
    • http://pevudavef.rf.gd/play_apple_music_on_android_auto.pdfIn PDF document text
    • http://durunorutap.epizy.com/how_long_is_truck_driver_training.pdfIn PDF document text
    • http://jowatazurusu.epizy.com/sogafipubazibeseve.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 5700 bytes
SHA-256: e3bd924635a2f5d204e0281009541686e5d511cc0c1f12ce61a5a417f6da65da
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10156 bytes
SHA-256: 95a78b6c53332b270ab508c15ea5d8d1c60cc3bbdfa07f25ce6bc84db3b0fde5

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