Malicious PDF — malware analysis report

Static analysis result for SHA-256 a199b2e2a7a8a129…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 22:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 182b7fd7887837bc9c2a18c3b38925bf SHA-1: b01aa96e0fa553a35d04186d9b8416191d4f7c88 SHA-256: a199b2e2a7a8a12979b308a10241bc04d75881ec00af566c3947592fca9a88eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a link with 'utm_term=dotnet+3.5+offline+installer' implies a lure to download software, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u1vcvlb5l47r0telptg3jdnq2k/98519842568.pdf In PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/vososoxatemaniwujizeso.pdfIn PDF document text
    • http://esangsok.com/upfile/files/bulizopurokirerefikega.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/jixasakuleve.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/sokexajijozet.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/nosufoxapujobiluziguritug.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb32aa2c67---16272815804.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/73044531831.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/posegim.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/51767236654.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/lagolofuno.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/95668697405.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/96762618454.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pisazijotezuribewovoka.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/tuforabusuroxugetusodi.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/sogavedazusox.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/71821110240.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/51244517568.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/goxifomewojatixidekasi.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/remorikorikokilisad.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/dolunisi.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/3974945254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dotnet+3.5+offline+installerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 17768 bytes
SHA-256: 0c519a4e68b9b77ea26710ee13887d0802c0a7412bad775653c01116c4632248
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 10580 bytes
SHA-256: 8c0f9e28055abcfe1b30a98ef936f76ed62a9e9fa9fb5327660f971023cbfe3a

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