Malicious PDF — malware analysis report

Static analysis result for SHA-256 bece10fee7fdbeb1…

MALICIOUS

PDF

78.4 KB Created: 2021-03-17 22:02:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3ea934105ded66e99734302814e991 SHA-1: 9cf6dc6f0cb1b89bc53f07096e469679e9dd065b SHA-256: bece10fee7fdbeb1c40c443fe5298d6cd26eecadd09fbc2e42d61138fcb3ae0a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains text related to Netflix and wkhtmltopdf, potentially used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/strik?utm_term=is+the+spectacular+now+on+netflix+usa
    • http://kaxavetaxudu.mywebcommunity.org/rujavawowipifewew.pdf
    • http://fekevopimibun.sportsontheweb.net/seventh_day_adventist_church_near_me.pdf
    • http://tortomsk.ru/officer_buckle_and_gloria_activitieslj9nn.pdf
    • https://static.s123-cdn-static.com/uploads/4414498/normal_6007120a50e37.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_604c984a228a6.pdf
    • http://lizoguxumugef.mywebcommunity.org/peniramuti.pdf
    • http://bawimip.sportsontheweb.net/palujizipoxew.pdf
    • http://wulutapebime.getenjoyment.net/78900311343.pdf
    • https://cdn-cms.f-static.net/uploads/4383702/normal_60373d0cdd0ff.pdf
    • http://cleaner360.shop/ginger_farming_guidexylp2.pdf
    • http://webmastervlad.ru/20214208304dzbda.pdf
    • http://gebuhrenfrei-mein.com/illinois_statutory_warranty_deed_formdnvpl.pdf
    • http://ludirobus.getenjoyment.net/55409211212.pdf
    • http://english-10.site/impact_texas_young_drivers_answers_lesson_5tlstl.pdf
    • http://jasazotinalol.mygamesonline.org/cardiology_case_files.pdf
    • http://rexuwoxaga.sportsontheweb.net/42174248066.pdf
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fe59dfb23bbc.pdf
    • http://jozipuvuwuzaj.mywebcommunity.org/addressable_fire_alarm_system.pdf
    • http://siwivelijutore.medianewsonline.com/nikon_dx_vr_battery_charger.pdf
    • https://cdn-cms.f-static.net/uploads/4407784/normal_60344238bc31c.pdf
    • http://rugegav.mywebcommunity.org/fallout_4_mods_without_bethesda_account.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zonivezada/48449484534.pdf
    • https://s3.amazonaws.com/sagotomagin/choptank_river_fishing_report_2018.pdf
    • http://bidejepeko.onlinewebshop.net/certification_of_origin_template.pdf
    • http://rodexiguv.onlinewebshop.net/adobe_editor_license.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e506.bin
a1dd969294a7165fac0e02833fa0dc2a192bf80688c06e075be8cee552b47ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 5080 bytes
font_01_sfnt_off0000f652.bin
4e6d599dfc1843f43a7b5d4fbe4052d35171dbed7ce2b51d88a691f69ea67d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 11732 bytes
font_02_sfnt_off00011db6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 4324 bytes

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