Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c88b9677d8b8b29…

MALICIOUS

PDF

90.7 KB Created: 2021-04-13 05:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 008ce6569d26a13721d846e525c4639d SHA-1: 77cc79b15b81450f907840236d765535354defe9 SHA-256: 2c88b9677d8b8b2929406e3f46620ff16096b538bc0db86d7a4549cafa001754
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The embedded URL and document body suggest a lure for downloading unauthorized software, likely a crack or exploit. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=mass+effect+2+dlc+crack+authorization PDF link annotation
    • https://cdn.sqhk.co/kamavedes/40jbihs/have_got_has_got_short_answers_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5ff5c1b7a9cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_605b60503a70e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_604b837ddc871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_601245a464bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_6028a0e663d49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444644/normal_5fca6cf627616.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/djf5Qhd/gukuser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5fcf0b8f4d5ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_5fd77c729e1a8.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/hehaalu/my_balance_water_purifier.pdfIn PDF document text
    • http://tujubafi.getenjoyment.net/lofomagadulijidesaxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_60450e8e77f63.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/9hhmijH/one_punch_man_wallpaper_hd_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/haMid37/eclipse_tomcat_outofmemoryerror_java_heap_space.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_a5345898d4174cb3a782dbfce6d0ba73.pdf?index=trueIn PDF document text
    • http://dixomivagarulo.rf.gd/22751004600.pdfIn PDF document text
    • http://sevuvev.epizy.com/wow_archeology_guide.pdfIn PDF document text
    • http://xobabikek.rf.gd/35255448751.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_bb29345458d349cd82ff12806bd1bb7f.pdf?index=trueIn PDF document text
    • http://kimatun.epizy.com/38458476673.pdfIn PDF document text
    • http://rawegutidum.onlinewebshop.net/25187902006.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_5d117f47ecb94dc7acc2f86adf4f68f6.pdf?index=trueIn PDF document text
    • http://tojuributesef.epizy.com/mafutedevogevalupevuj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 3144 bytes
SHA-256: 24ebb064c197a5b78c27656756748626d41dcf4a5f5c459aaa3cd87177d36d22
font_01_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 5244 bytes
SHA-256: 0cf95d385df536ff4a6e57e69809817d897b454c7854f08d56950730c60e5602
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 14796 bytes
SHA-256: 459352ee80c411efe014bb5eafdfcc0b3f939c2aaa0e890cf8dcdeaa10ed953d
font_03_sfnt_off00014ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c