Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e5e89da89ba582…

MALICIOUS

PDF

76.8 KB Created: 2021-03-26 03:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1b624ba1d2b974b9a3fee77ce4caca24 SHA-1: 3e595db36c147025ff979522cf2309112228432c SHA-256: d2e5e89da89ba582c958284cec074e49af6e71f73367bf4449a433c1d7b912d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to a textbook, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=anatomy+of+the+brain+textbook+pdf PDF link annotation
    • http://sadovik.me/how_much_for_english_lessonswgbap.pdfIn PDF document text
    • http://zaxofebejip.66ghz.com/novubazovuze.pdfIn PDF document text
    • https://cdn.sqhk.co/pajugeluj/Vhahczp/zubavi.pdfIn PDF document text
    • http://dlkmvkoenv.info/white_rodgers_thermostat_1f78_installationv4ha9.pdfIn PDF document text
    • http://inmyshtangen.xyz/61004871093zceug.pdfIn PDF document text
    • http://manapuzasupin.sportsontheweb.net/nibotawategugudajem.pdfIn PDF document text
    • http://game-pro.xyz/57889423141vuob1.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/ijfggzU/online_basketball_scoresheet.pdfIn PDF document text
    • https://cdn.sqhk.co/diduwuposenu/Khh931K/kifeguku.pdfIn PDF document text
    • http://vinograd.io/495808338410ltf2.pdfIn PDF document text
    • http://catsism.com/6759312906mk5jh.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/9IY8jgw/matugew.pdfIn PDF document text
    • http://letalaxaraxudum.iblogger.org/what_are_sentry_safes_made_of.pdfIn PDF document text
    • http://natnat.fun/arduino_ide_on_chromebookzkprn.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/f2hbfKA/thrill_rush_theme_park_oyna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolevusafo.myartsonline.com/what_are_the_stages_of_human_evolution_in_their_proper_order.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/our_god_reigns_chords_israel_houghton.pdfIn PDF document text
    • http://fowodusozid.epizy.com/beropexesamofap.pdfIn PDF document text
    • http://nosofaxiwobud.epizy.com/societal_multilingualism.pdfIn PDF document text
    • http://rofizarikapa.rf.gd/63021550698.pdfIn PDF document text
    • http://tamedigozetot.epizy.com/why_wont_my_garmin_update.pdfIn PDF document text
    • http://tivusanezidiv.rf.gd/4767146635.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/darebawiwimedekera.pdfIn PDF document text
    • http://zobidixit.epizy.com/vibalonoxodijowoluput.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/bill_gates_autobiography.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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 5432 bytes
SHA-256: 714969031c24f3471699e9b27e9892f740ea1d26bf7e950e06a6feee6acffb50
font_01_sfnt_off000100c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 11316 bytes
SHA-256: 414cd2817eadd38d699b7243c2305bf12a55336a9d58a23becb479917e49ee5f

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