Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19fb776c1baffa2…

MALICIOUS

PDF

67.0 KB Created: 2021-02-26 11:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4d6ba5c93b4e007de49c6fbc03fc6032 SHA-1: 716097a85ea7a44266520330b43bb151705de00a SHA-256: c19fb776c1baffa2bf0f011f0539ec180442a94c1c8d4a259a16c73c7a846a1d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the heuristic indicating a link farm on disposable hosting strongly support a phishing or malware distribution attack pattern.

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://baarspo.ru/wb?keyword=bd%20eclipse%20needle PDF link annotation
    • https://cdn.sqhk.co/jujuziwe/hjhcsba/free_jibjab_type_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/8tFYU5q/farm_animals_pictures_to_print.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/jiNCMUT/wiketude.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/a58c88a.pdfIn PDF document text
    • http://nedabemimekoz.iblogger.org/formato_de_cedula_venezolana_vacia.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/fokevu.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/544499.pdfIn PDF document text
    • http://noxitafevinuv.22web.org/wovepikekaponuvufakif.pdfIn PDF document text
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/03c8f79a0fe4e.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/diluwuteloz.pdfIn PDF document text
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/9989589.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/jibinipup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/google_sheet_count_distinct.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/73173905060.pdfIn PDF document text
    • http://derefoxawuziten.rf.gd/peptic_ulcer_guideline_2018.pdfIn PDF document text
    • http://vimozav.epizy.com/61336102834.pdfIn PDF document text
    • http://nonozud.rf.gd/aberrant_spectre_slayer_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/tippmann_98_custom_pro_flatline_barrel_for_platinum_paintball_marker_series.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_off0000cbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAD 4808 bytes
SHA-256: aa091cc1c298a1573623bbbe14c7371148725c9b9e6cf91fd77b3bbc2a2281c0
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 10344 bytes
SHA-256: 5f4dc62e8e67b59c31ec7aff1df6d9dac09b68f2b232a2fd3d03f57a8574de85

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