Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb83bc1e6499bf7b…

MALICIOUS

PDF

93.8 KB Created: 2021-03-17 07:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a66ef8565ea1bb1f9e8f46b86647c02 SHA-1: 92974e4c0559fe3e79295a5b41bf82844f6ea892 SHA-256: eb83bc1e6499bf7b9defe3b5703d76e19c0a544115fc5b9bcdb11581fab49570
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://xajibur.ru/wix?keyword=brown+v+kendall+pdf PDF link annotation
    • https://cdn.sqhk.co/zoluxoni/ejajgIZ/teppanyaki_restaurant_el_paso_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/mosizuwowux/bgcghjg/prevent_form_submit_jquery_validate.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/pTHEnUe/gas_abolishment_form_victoria.pdfIn PDF document text
    • https://jugubiwujivivej.weebly.com/uploads/1/3/4/3/134352954/7782898.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/5205065.pdfIn PDF document text
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/4865479.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/fvjj1ii/87804720491.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/jcLLTh1/3419571621.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/4b6fd2960.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/learn_korean_for_free_online_with_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/gjiMhdj/impulse_response_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/Migptjj/navel.pdfIn PDF document text
    • https://pobanuruwogijo.weebly.com/uploads/1/3/4/8/134882751/kisurogope.pdfIn PDF document text
    • https://wavujosivisero.weebly.com/uploads/1/3/2/7/132740585/wupipaginivon_nurev.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/ifihjec/army_car_driver_mod_apk_home.pdfIn PDF document text
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/6733739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxegejuw.atwebpages.com/the_royal_standard_flag_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a09916-4096-4bc2-a1f7-a3d27859067f/xulepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee0da50-6097-4062-afd8-a06ff65e5de5/zazojijaxobemaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c99eb44-424c-4a62-856f-acd449e7af94/fios_remote_blinking_red_5_times.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 3080 bytes
SHA-256: aae8700dc3f82ed02e9b3d8843ad2a81c137386f717982beda29cbafea22295d
font_02_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 5120 bytes
SHA-256: 1fd3f17122cc901d78f8371c48b02e42b0d5dab970e4efda0ee66595e572da1c
font_03_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 1760 bytes
SHA-256: c62eff0269b2e3552287005109a3d710ee19f9e9e2a29d11d7ea5b3730269372
font_04_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 11704 bytes
SHA-256: 37a37aa18101e2833fba119d47dc705e6d13cd8065d916c7ff46b2aa49a528f8
font_05_sfnt_off00015227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15227 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17

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