Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b45ec70209ae5b…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 02:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 03b2c63c6f25b0c9d39a25b6763ff3b9 SHA-1: 7231c758c80f3565ca2745807695ee356021c187 SHA-256: c0b45ec70209ae5b9b1aa4998f1364da3ac2c792ff60585cd07d07d43eeba6d4
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links on potentially untrusted hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=south+film++love+story PDF link annotation
    • http://masuxuxu.iblogger.org/34055995515.pdfIn PDF document text
    • http://faniwojelanebe.22web.org/elf_yourself_office_depot_free.pdfIn PDF document text
    • http://fowatufilomit.iblogger.org/york_yvwa_chiller_manual.pdfIn PDF document text
    • http://lewodazegozi.iblogger.org/sharp_aquos_4k_tv_manual.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/potuzeziwesejo-susapaf-mipedujesu.pdfIn PDF document text
    • https://zelosadu.weebly.com/uploads/1/3/1/3/131379518/1481b86b8.pdfIn PDF document text
    • http://parralax.net/printable_coloring_sheets_for_fallc2zyu.pdfIn PDF document text
    • http://pekibule.iblogger.org/character_traits_worksheets_for_3rd_grade.pdfIn PDF document text
    • https://povoxiguda.weebly.com/uploads/1/3/4/0/134016665/detutudobejajijul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zodejewab.epizy.com/refap.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/4730238977.pdfIn PDF document text
    • http://dujojovixotik.epizy.com/sejudovejorepobu.pdfIn PDF document text
    • http://laboluvimaniraf.epizy.com/easy_sheet_pan_bruschetta_chicken.pdfIn PDF document text
    • http://zasidad.epizy.com/48425577097.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/68288113642.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/bottomsheetdialog_background_transparent.pdfIn PDF document text
    • http://gilovimarej.epizy.com/teri_galliyan_bansuri_song_ringtone.pdfIn PDF document text
    • http://bitegovaduxigag.epizy.com/zujikasasoxemodo.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/chaupai_sahib_in_punjabi_audio.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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 5064 bytes
SHA-256: 25a5630a9b4c37b112b02935501cb6885e5c5470378c32588a049de1597180ea
font_01_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 10848 bytes
SHA-256: 191d28d7d63b7fd17d79a20dae7caf4ad40282de95fa3fa2c9e3eaefae9490ba

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