Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8cf3e5949396f7…

MALICIOUS

PDF

80.6 KB Created: 2021-04-02 12:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a01e5a504ba8c29aa18db025434d00b8 SHA-1: ba82cf77ffe3f0345111ce0f87b522bbc117aae9 SHA-256: 8c8cf3e5949396f7472ffc812cb74fe3c8a76e2243e54e0ddd438c13b7d5c360
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to 'Imusa pressure cooker parts', likely a lure to direct users to malicious URLs such as https://vilenefex.ru/strik?utm_term=imusa+pressure+cooker+parts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=imusa+pressure+cooker+parts
    • https://mitapesazo.weebly.com/uploads/1/3/4/6/134652839/f7ce5f777e.pdf
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/c6b85.pdf
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/065b14149a.pdf
    • https://zujamapetot.weebly.com/uploads/1/3/1/3/131381682/3209358.pdf
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/deb12f8576.pdf
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/7304265.pdf
    • https://figurera.weebly.com/uploads/1/3/4/4/134437403/9362337.pdf
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/4951754.pdf
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/vojatijukam.pdf
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/siremanozifuj.pdf
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/3674084.pdf
    • https://pazodozonevaken.weebly.com/uploads/1/3/4/6/134606284/60ebaed488e0f.pdf
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/543799.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4f81b26b-5f77-496c-bac8-c16ca4d85cb9/viruf.pdf
    • https://s3.amazonaws.com/dinilederu/6th_grade_math_vocabulary_words.pdf
    • https://s3.amazonaws.com/xoguwavosuje/raworaxazo.pdf
    • https://s3.amazonaws.com/tikoweravisixu/the_taming_of_the_shrew_summary.pdf
    • https://uploads.strikinglycdn.com/files/9ba0f8dd-f65d-4cbd-940b-4fb407d7a98f/72548411062.pdf
    • https://uploads.strikinglycdn.com/files/cf6005c1-8115-43e2-9614-b4d08336dd03/xefofapuxoj.pdf
    • https://s3.amazonaws.com/wivunonovef/zikuwunuvi.pdf
    • https://s3.amazonaws.com/mutirexa/car_simulator_2_oppana_games_mod_apk.pdf
    • https://uploads.strikinglycdn.com/files/d89f582b-5102-4f86-89ed-3af3200dbc65/rgb_color_chart_for_printing.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff44.bin
3186ee79b5b4b198257a49ac3701bfa5cd963df28d0c5147e01433c1386ac3a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 5048 bytes
font_01_sfnt_off00011056.bin
73f7a0b0769db10507d836506c6b914052b6dd1cdfd0182f9353c54f63336864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 10988 bytes

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