Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c14d3df967d0bb7…

MALICIOUS

PDF

101.9 KB Created: 2021-03-20 22:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9b6549e15d6abbac086b0cdf7c4cf68a SHA-1: d1318f0e9e4a6a1070227b7ac65c1644d19e8332 SHA-256: 5c14d3df967d0bb78a3081c3d910eeb4e383fdd1e0f4257c25fc6629f9dac635
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a book review, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nipisod.ru/strik?utm_term=the+meaning+of+marriage+tim+keller+review PDF link annotation
    • http://penafur.scienceontheweb.net/1272879952.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/ThfkVmH/pokemon_yellow_gameboy_color_price.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/b._arch_syllabus_2020.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/pevidebadi.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloxezajaga/mjjhTji/tourific_escapes_hollywood.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/d6DvRii/hyperspin_arcade_cabinet_for_sale.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/basic_boxing_combinations_workout.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/RijKdop/walking_dead_season_finale_watch.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/infinix_note_4_x572_price_in_kenya.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/proceso_de_absorcion_de_proteinas.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/cHtjfjb/muslim_ringtone_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/jdhdgeI/n64_emulator_games_pokemon.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/ihIip42/4funkyflavours_sale_heren.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/33007419805.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/gfifger/project_drift_mod_apk.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/what_are_the_elements_of_a_musical.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/Uiibjc3/c_async_windows_forms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/cochlear_phone_clip_quick_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976475ba-dac7-4687-8787-d683ff9cd58c/widef.pdfIn PDF document text
    • http://maxuluxusit.atwebpages.com/41301903460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da42288-9ae7-4e32-98f6-1ad011bc3ddc/bumovebupanulezeleli.pdfIn PDF document text
    • http://fazobelo.onlinewebshop.net/15983358651.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/31999514120.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 6548 bytes
SHA-256: 96dd2fc0f29e4e72cc5c2e2558c4128b545e184584c6e82281828d37e57e44b6
font_01_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 5168 bytes
SHA-256: 92a14170b239d41f7865f80c3cafd54e852bd56009b9626514cb3bff136571c3
font_02_sfnt_off00014ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA8 11084 bytes
SHA-256: 8a35e1c038e7e5a7bded46b54d3689a74eb293fe82f93b932e0a874fa59ffaa8
font_03_sfnt_off00017192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17192 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf