Malicious PDF — malware analysis report

Static analysis result for SHA-256 35144795673015bf…

MALICIOUS

PDF

84.1 KB Created: 2021-02-17 00:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1e0d555b291557c9fd5c35379109f8ec SHA-1: 678c1fc8ec6dc43a4e293bbb607a49e414fe9c91 SHA-256: 35144795673015bf41128f58a4028ec5eb9daf68e5b4d3668b5ac74ce79e12d1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it might be a generated PDF. The presence of multiple external links indicates an attempt to redirect users to potentially malicious 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://jottigo.ru/strik?utm_term=tl-wr841n+bridge+mode PDF link annotation
    • https://cdn.sqhk.co/ruxukulalodi/ji4Eihq/bibiwuzaguselov.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/GM2gdia/best_3d_archery_targets_2019.pdfIn PDF document text
    • http://detonicufficiale.website/xebukesuzedezverhn.pdfIn PDF document text
    • http://shortsomfj.space/132731894883pi9j.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/Dhbczhi/dhoom_4_cast.pdfIn PDF document text
    • http://shtancircul.site/99323121655ykwoe.pdfIn PDF document text
    • http://shmelev.pro/tisalug91o9y.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/2qYgjzC/bibagavuwamelapegom.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/biiehjs/fubozujarogix.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/jiZgggc/download_game_epic_battle_simulator_1_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/bQIrmjd/car_scanner_elm_obd2_app.pdfIn PDF document text
    • http://therarbooks.com/34638812278xdigs.pdfIn PDF document text
    • http://monstergym.ru/ravuxelinaxulofujal0ybdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejutamukedus.epizy.com/assistir_globo_reporter_ao_vivo_pela_internet.pdfIn PDF document text
    • http://ritanuwo.epizy.com/best_astrology_software_app_for_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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 5304 bytes
SHA-256: bd85a0bfa76386cecdac76410c3a4ab7648a96b05738cd19df32677461e73161
font_01_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 10480 bytes
SHA-256: 0f18402193a6a97161f4fea5ffc7892a50d218602d2aace112ffc8578d59d860

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