Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcea5733bc4df81…

MALICIOUS

PDF

123.3 KB Created: 2021-03-02 19:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 14e6aa05d8de588e014b13a797882c79 SHA-1: 90f32f19c299bf3b01a02feb214baa7c3f8cb4bd SHA-256: 5fcea5733bc4df81edd922fa7342956c07164718b8fdb53346ca9c18dbb32c42
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document is designed to trick the user into executing commands, likely to download and run a secondary payload. Numerous external URLs were extracted, many pointing to disposable domains, further supporting a phishing or malware distribution scheme.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/wix?keyword=sketchup+linux+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fd3112181b3f.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/sgeBgdR/thrift_shop_clean_roblox_id.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5fc900619d1e2.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/kEjeH6Q/boku_online_casino.pdfIn PDF document text
    • http://ratonawe.iblogger.org/77892003478.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/fuzovafavosufuvuxepi.pdfIn PDF document text
    • https://cdn.sqhk.co/videmixolute/xahfhem/8899979303.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/what_is_after_new_moon_twilight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_6019c1ab7641d.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/9gehcha/hd_camera_pro_app_test.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/hdmidge/tornadoes_today_in_arkansas.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/cazadores_de_sombras_pelicula_completa_sub_espaol.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/74381630383.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/magic_tree_house_merlin_missions_1-4.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/XBjglgi/favukokekulutemavewamofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://geforagegi.atwebpages.com/87303208596.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/beats_solo_hd_wired_replacement_ear_pads.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_off0001989d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1989D 5292 bytes
SHA-256: 10c13f2b0fb395cfc24e2017cf830dc08f002cef0bac5e136a2a6593fcd56c64
font_01_sfnt_off0001aaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AABA 17256 bytes
SHA-256: 7d05459b7ef315bee32dca62f9455c45b9bbf075c66f37ce8450d0ef10b762a0

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