Malicious PDF — malware analysis report

Static analysis result for SHA-256 900b0ca12567db8f…

MALICIOUS

PDF

75.2 KB Created: 2021-03-10 21:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1183633a15b82083ec0c8d15bcbc1f3 SHA-1: 76aca514166a58b8d86a6b9947b580b312ac3452 SHA-256: 900b0ca12567db8f7393d3d76a290c4a1262c6de656f6603bb31dd17261a9800
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, some of which are confirmed benign, but the primary URL https://ponafet.ru/wix?keyword=arduino+nano+manual is suspicious and likely leads to a malicious payload or phishing page. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=arduino+nano+manual
    • https://cdn.sqhk.co/labifikup/gjjiiaq/hover-_1_titan_all-_terrain_hoverboard_electric_scooter.pdf
    • https://cdn.sqhk.co/tefazaturar/a7iejjl/jajokopunog.pdf
    • https://cdn.sqhk.co/kinemefuwa/i5Zs2yd/85798494741.pdf
    • http://duwudivusupo.mygamesonline.org/college_algebra_clep_practice.pdf
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/1714319.pdf
    • http://minesaxofunawi.getenjoyment.net/3_4_view_face_sketch.pdf
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/6e1f6c413.pdf
    • https://cdn.sqhk.co/senosekagoko/WPjeOjb/new_bhojpuri_comedy_movies.pdf
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/1199478.pdf
    • https://cdn.sqhk.co/walamalesumi/U1V5giJ/classic_words_solo_for_windows.pdf
    • https://cdn.sqhk.co/dulemokel/Hggiaha/free_bollywood_new_ringtone_2020_download_mp3_dj.pdf
    • https://cdn.sqhk.co/wafixagi/Lzjefhd/52836905903.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sajoveguduv.onlinewebshop.net/79015638589.pdf
    • http://vewofosel.rf.gd/online_game_8_ball_pool.pdf
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_637a88a24ff04e4f9f696ee168a906b8.pdf?index=true
    • http://mojenuj.atwebpages.com/functional_and_nonfunctional_requirements_of_hotel_management_system.pdf
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_f5c7233abc9a42aebc3ab22c3c015831.pdf?index=true
    • http://nepokeda.epizy.com/documents_to_converter_software_free_download.pdf
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_0591bddb1edb4afd971ffd599d3cab0c.pdf?index=true
    • http://nekegax.epizy.com/black_and_decker_replacement_spool_cap_for_string_trimmers.pdf
    • http://xinifaduzinuvu.onlinewebshop.net/80195465233.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2c.bin
b840677cb34f4d413070e5bd81bee374dda8763b7832d7e604418b256b386054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 4780 bytes
font_01_sfnt_off0000fd54.bin
79010f6c63cf7e200bebb1b73e1d73d75aed558a1c245b8f5ec3e4fee752c9b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 10032 bytes

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