Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea52e2f3eac404c…

MALICIOUS

PDF

93.7 KB Created: 2021-03-18 21:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 13e6ca9ccccb62f8b53778f73d3c2826 SHA-1: f42fb96d084d2ed75c8d3f1a691db05353c2ced4 SHA-256: aea52e2f3eac404c8ed6b9d0fab8fec2eb1d51e30db566574be0fb37ab3f4d58
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of external URIs and the link farm heuristic suggest the primary goal is to direct users to potentially malicious websites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=angina+de+pecho+electrocardiograma+pdf PDF link annotation
    • https://cdn.sqhk.co/sadamire/b8gRCgh/xajatuzewifiwerojujozi.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/sutad-jegupi.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/PUggC1L/19783653293.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/ukulele_tabs_download.pdfIn PDF document text
    • https://rebasikerebevo.weebly.com/uploads/1/3/4/0/134016880/pusunap.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/2m5UXhd/59648497543.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/CsVih9v/15166393302.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegizeso/huwqiSo/any_year_calendar_template_word.pdfIn PDF document text
    • http://pimolala.22web.org/jm109_competent_cells_transformation_protocol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gapumigexoze.epizy.com/what_is_relational_dialectic_theory.pdfIn PDF document text
    • http://wudumiwetoveri.rf.gd/critical_ops_apk_ipad.pdfIn PDF document text
    • http://xasaduditomup.epizy.com/how_to_know_if_your_ac_blower_motor_is_bad.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/pintura_acrilica_blanca_manualidades.pdfIn PDF document text
    • http://tudozujuxijoz.rf.gd/the_ruins_of_gorlan_pages.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_fad2a34ad8b24ac78f79ef417ab4e503.pdf?index=trueIn PDF document text
    • http://lirolodo.rf.gd/45517245401.pdfIn PDF document text
    • http://kulitetokap.epizy.com/gejinabotog.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_08d77736fc2645a9929e0f93c12041a5.pdf?index=trueIn PDF document text
    • http://latosenepodukum.rf.gd/can_monks_use_weapons_5e.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_0b3c9c8ee382422b8ec3e36d7ebd7dd6.pdf?index=trueIn PDF document text
    • http://fuzuxoluzetirig.rf.gd/denuvurulezesenikil.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_off00011b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B57 5380 bytes
SHA-256: fc4f970b566f3b48f59d725f51b589272a72c8eca3d2ec02d464b9479589856f
font_01_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 11524 bytes
SHA-256: 45adb804d1a2076e72bba2836bfbd0d7d1cbcf2b8ba3d3d7039a114e910d6abd
font_02_sfnt_off000152ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EA 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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