Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8db1679b509693…

MALICIOUS

PDF

70.0 KB Created: 2021-01-17 06:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 481e12fe66f37c7dfa68e3d3e0e7e3a0 SHA-1: 790822c968cba571f064f5d4845bf5f515ac8041 SHA-256: 8d8db1679b50969391cb2862ee2c2fccadffef0f243015de8a7a2d965a877f67
184 Risk Score

Malware Insights

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

This PDF file is classified as malicious and contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://traffmen.ru/123?utm_term=is+potato+a+vegetable+or+carb'. The document body, though heavily obfuscated, appears to be a lure related to search queries, suggesting a phishing or scam attempt. The presence of multiple links to disposable hosting further supports a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=is+potato+a+vegetable+or+carb In PDF document text
    • https://site-1215266.mozfiles.com/files/1215266/djembe_drum_music_sheets.pdfIn PDF document text
    • https://site-1175753.mozfiles.com/files/1175753/88379759012.pdfIn PDF document text
    • https://site-1245455.mozfiles.com/files/1245455/scientific_calculator_for_android_apk.pdfIn PDF document text
    • https://site-1249670.mozfiles.com/files/1249670/23505269090.pdfIn PDF document text
    • https://site-1256192.mozfiles.com/files/1256192/activesheet__shapes__range_array_picture_2__select.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/lovoxukun.pdfIn PDF document text
    • https://site-1168383.mozfiles.com/files/1168383/airline_pilot_uniform_history.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f9c32318e38d.pdfIn PDF document text
    • https://site-1178336.mozfiles.com/files/1178336/difference_android_oreo_and_pie.pdfIn PDF document text
    • https://nilanifek.weebly.com/uploads/1/3/4/4/134466172/gejejolen.pdfIn PDF document text
    • https://site-1241652.mozfiles.com/files/1241652/video_er_hd_for_pc.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/wifi_doesnt_work_on_my_android.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/76446418386.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/xabalaru/sezemoxepenuvo.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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 5236 bytes
SHA-256: fc36bb757b5d4861dfb0b88006676f6c59a3485895065c05561ae44b92a1d779
font_01_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10412 bytes
SHA-256: cd5127445767941d8e8e40719e8c76ce14bb75b869827aa3536e6deaa3e94f98

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