Malicious PDF — malware analysis report

Static analysis result for SHA-256 f137783c356d6e96…

MALICIOUS

PDF

78.6 KB Created: 2021-03-04 10:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f3d00ac4cc43daddd5610bd2025bc6c6 SHA-1: e746e320cf65d2ad8f9e65cefb0a39e91f16ba44 SHA-256: f137783c356d6e9683c5d90056ffcef4f6146418a51ef18e5f1a236f5a446fd6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/wix?keyword=e-prance+f90+hd PDF link annotation
    • https://cdn.sqhk.co/vimewiki/heHjgtk/the_wolfpack_parents_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/jlhajcD/civilopedia_beyond_earth_rising_tide.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/IibhcJX/tolebopupuwozododusotab.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/ageijv2/sea_bream_fish_pictures.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/80607337414.pdfIn PDF document text
    • https://xoruvuxana.weebly.com/uploads/1/3/2/6/132696063/d8e062f3.pdfIn PDF document text
    • https://cdn.sqhk.co/mapexovebo/6jjghjb/best_slayer_master_osrs_for_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/YrXMRhe/suxomawajipomo.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/a9b3cde5.pdfIn PDF document text
    • https://fimedezederuru.weebly.com/uploads/1/3/4/8/134884956/3551247.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/subulugime.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/egdNgju/anger_of_stickman_4_mod_apk_download.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/fezevizudabebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/what_is_a_good_beginners_wine.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/majedar_chutkule_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/whirlpool_microwave_manual_wmh31017hz.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
    • 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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 5320 bytes
SHA-256: 34d034320ca69e765b57f102feb8eebcc69f70401fee3cf2390f3c8e7dfd673c
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 10800 bytes
SHA-256: 100bc23047fe25d1dc89744c14e9addb72197f85656079bff718a55911003cca
font_02_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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