Malicious PDF — malware analysis report

Static analysis result for SHA-256 d621c1ebd6ee96f8…

MALICIOUS

PDF

70.7 KB Created: 2021-02-23 03:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: da8b23fc5e2e248fc9ff5aacf2613c09 SHA-1: 99bdb067a5ff5a5f4f7191fdcd866196aed8e076 SHA-256: d621c1ebd6ee96f8258747b966323f7840a27f224eb1b3bd7de30b8373577e2e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body text, though partially corrupted, includes a keyword search query related to downloading applications, aligning with the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=download+taps+for+money+apkpure PDF link annotation
    • http://shoop-fr.ru/ejercicios_de_chi_cuadrado_resueltos_en_excelhz7tt.pdfIn PDF document text
    • http://load-bcp.com/pejogojwth06.pdfIn PDF document text
    • https://sitotibaw.weebly.com/uploads/1/3/4/7/134752740/22026.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/bAfuOhb/mizabug.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/9245856.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/hchfUJp/mazudaxonanowuxodipukifur.pdfIn PDF document text
    • https://cdn.sqhk.co/nusekuferiva/jhnMVhh/zombie_gun_fire_apkpure.pdfIn PDF document text
    • http://kimujitotam.22web.org/balloon_pump_waveform_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/AicgfIK/lathe_machine_price_olx.pdfIn PDF document text
    • http://bebolekuku.22web.org/88586591163.pdfIn PDF document text
    • http://radanews.site/a_long_walk_to_water_unit_test_answersjs991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jexoxitisujoj.rf.gd/how_to_set_date_and_time_on_citizen_eco-drive_watch_e820.pdfIn PDF document text
    • http://sejekaxupoze.epizy.com/hisense_air_conditioner_heater_mode.pdfIn PDF document text
    • http://bevonox.epizy.com/hmmwv_quizlet_answers.pdfIn PDF document text
    • http://fomabobas.epizy.com/does_dunkin_donuts_have_peppermint_mocha.pdfIn PDF document text
    • http://toduwez.epizy.com/search_by_photo_android.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 5444 bytes
SHA-256: 6928f868dadab3cf26245e6bfd8211f9a95a129443cf61dda41c6a7aa56d8c49
font_01_sfnt_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 10644 bytes
SHA-256: 188a7901b8639104c997c2aabc8e458fa483bd9e4437abbe1d9390a673778268

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