Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42c31fc2fa5736e…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 04:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7a477a6f5e2277f11a0452931c97e6b6 SHA-1: 258db92dc97aae21e516b53a1e188b0e66a847fe SHA-256: b42c31fc2fa5736eb1c3125475ae5c036a73cfb2ee881ca62a01ce1da02e8e96
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=1997+ashrae+handbook+fundamentals+chapter+28 PDF link annotation
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/guzidisoxonumuzufud.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/how_will_you_manage_your_time_in_the_classroom.pdfIn PDF document text
    • https://sozazisoxiz.weebly.com/uploads/1/3/4/4/134463449/8406642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fcff2ca246b5.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/ifvozgj/marketplace_cars_for_sale_near_me.pdfIn PDF document text
    • https://bapizemu.weebly.com/uploads/1/3/1/1/131163962/cdc97e07f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fdf85fc56722.pdfIn PDF document text
    • http://rekabiwuxu.22web.org/17944220826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_6028f2e2d7972.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gjbgxjd/t_mobile_near_me_opening_hours.pdfIn PDF document text
    • https://tukareteran.weebly.com/uploads/1/3/5/3/135307171/f5b2d2f97594d.pdfIn PDF document text
    • http://sadifiba.iblogger.org/2000_ford_ranger_stepside_camper_shell.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/ffa4a7d76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lubudag.epizy.com/tupiperisimepuxuj.pdfIn PDF document text
    • http://zavinawotomuvef.epizy.com/ssk_askerlik_borlanma_formu.pdfIn PDF document text
    • http://fuvojofud.epizy.com/32781602004.pdfIn PDF document text
    • http://rupadulogoliwid.epizy.com/31797119686.pdfIn PDF document text
    • http://dajivetu.rf.gd/shoprider_streamer_sport_888wa_battery.pdfIn PDF document text
    • http://tutunod.epizy.com/cake_decorating_beginner_s_guide.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/what_is_the_price_of_ipod_touch_in_pakistan.pdfIn PDF document text
    • http://monulaw.epizy.com/how_to_get_a_new_marriage_certificate_ontario.pdfIn PDF document text
    • http://putajamesar.rf.gd/oracle_forms_weblogic.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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 6120 bytes
SHA-256: 70e42b90720917611a264e0164fd815fcbdd8ec667c23204801f5569ecd964ed
font_01_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 11064 bytes
SHA-256: 126cc4a5ba6d16b3482397d1fc5f6fe126da677fefb4fb25a113163cdafcb7bb

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