Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe203ef8861be94…

MALICIOUS

PDF

76.6 KB Created: 2021-02-25 20:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e12a3bf5047442ecf77ea35ad9d6430e SHA-1: fb7ff8c41cc9ca346127ce36429369c5740296b1 SHA-256: cbe203ef8861be94f96dcdb2df7b233d5a0028a54490f36f99d56259f3dcc522
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to coffee makers, likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=how+do+you+use+the+clean+cycle+on+a+black+and+decker+coffee+maker PDF link annotation
    • http://bosemefawixuwov.mypressonline.com/jeep_tj_ls_swap_manual_transmission.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_6034799f0cd56.pdfIn PDF document text
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/rezakalamisajip-silit-pikibirovojuden.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/79799.pdfIn PDF document text
    • https://jowovodepavilim.weebly.com/uploads/1/3/4/6/134651336/1762309.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/how_to_get_nfl_sunday_ticket_for_free_on_roku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ff8b5a93527a.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/whats_the_best_handheld_steam_cleaner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fd5f07da5b52.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/jukovoxifofat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465704/normal_5fcebd6bc8771.pdfIn PDF document text
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/vitaxurutarikono.pdfIn PDF document text
    • http://sweetmeet.online/6116700035g4nyp.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/fukixaxu.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/2013_dodge_charger_leather_seat_covers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/honda_eu6500is_battery_charging.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 5620 bytes
SHA-256: a7febbacf599770ebcb46d05b309f989af387054060657e99444c4af79047775
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 9828 bytes
SHA-256: 14f6b12a149a7f14179f64cd7932e288b66275e224d4d80780581a96222b28ca

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