Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69fde95db7503dd…

MALICIOUS

PDF

80.1 KB Created: 2021-05-02 23:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: af9018bfc97dbcf850aa6d74d6772908 SHA-1: cdfd10ce7468238779cf057f6f0e1bd8df28a217 SHA-256: c69fde95db7503dd3ea123473a4f6f727ccb782680cb0a82fa4de528a64af8bc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=polaris+280+manual In PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/9282995.pdfIn PDF document text
    • http://postel-na-zakaz.ru/jang_e_siffin_in_urduycri3.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/ejjdGI3/zoo_tycoon_dinosaur_digs_download_full_version.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/linux_add_text_to_file.pdfIn PDF document text
    • http://bluebadge-support.com/godus_wars_reviewo68xe.pdfIn PDF document text
    • https://cdn.sqhk.co/juzogimuju/xbfBuif/employee_retention_bonus_letter_template.pdfIn PDF document text
    • http://fomoregekamikat.mypressonline.com/xilemurubevuwakuj.pdfIn PDF document text
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/3486795.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/Ezkjdjd/red_alpha_swordtail_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/aPCjc4Z/getosuwukoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofududegotu.epizy.com/jilarak.pdfIn PDF document text
    • http://xesepodine.rf.gd/andante_andante_abba_sheet_music.pdfIn PDF document text
    • http://busisaviw.epizy.com/semojuguro.pdfIn PDF document text
    • http://gunexukod.epizy.com/92470877088.pdfIn PDF document text
    • http://fomupobidep.epizy.com/31424109648.pdfIn PDF document text
    • http://tuzikarowom.epizy.com/machine_embroidery_thread_conversion_chart.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5300 bytes
SHA-256: 07070d820df1d8157db99c79334e9de916e5b354336fc038fc1e20e9e637d01d
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 11840 bytes
SHA-256: c934d9a63c246ae9705c58f329cf4e92189c596db377c70281c0d61de6280744
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16232 bytes
SHA-256: 90063111fd84fc9d3bbe0e91a25c30074b178549c4c86487e0bfae44fa44017a

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