Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d58986cebf403f…

MALICIOUS

PDF

92.4 KB Created: 2021-03-23 01:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e4122151aaae78fd8eaa4a23dc09d8b7 SHA-1: e450c3e8253f3d7addbc4f6a850811c693af4fd5 SHA-256: c8d58986cebf403f7a6db2539dfbc04b74932fe1360bd2c31948c207ea5551bb
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no direct textual lure is discernible.

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
  • 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://xezojetit.ru/award?keyword=critical+path+method+in+construction+management+pdf PDF link annotation
    • http://tideboweped.medianewsonline.com/functions_and_formulas_in_excel_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495042/normal_6002d4ad15ced.pdfIn PDF document text
    • https://cdn.sqhk.co/foxinukepo/gdihhiC/splendor_in_the_grass_1981_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/h6hkH92/25769549556.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/wuwuvatusureroluzaze.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/e00f641060b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_6023fcb7d9ab9.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/wavelets_and_filter_banks.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/jhLibjf/16286385627.pdfIn PDF document text
    • https://besaxujujugolu.weebly.com/uploads/1/3/0/7/130739491/706bced85d023a4.pdfIn PDF document text
    • http://nabokuwaj.iblogger.org/n_r_c_full_form.pdfIn PDF document text
    • http://xutuxul.22web.org/arabic_characters_are_disjointed.pdfIn PDF document text
    • https://tazokadenu.weebly.com/uploads/1/3/2/6/132695553/mavobanusemuwasuval.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d208420-2118-445c-88e3-25e50291ad57/36441997142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54f95fa-cd5b-4ff7-8ea4-6b9f9cd3afa1/what_is_the_wps_button_on_a_canon_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46e33b5-5f3c-4837-80dc-9f6392e432ad/how_to_treat_burning_rash_on_face.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814d8753-5c2b-4c14-a310-7ffaf2252efe/huckleberry_finn_book_synopsis.pdfIn PDF document text
    • http://farovosodiwes.atwebpages.com/break_even_point_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba6d248-b37a-4bae-afad-6e74dd2381b2/honeywell_econoswitch_rpls740b_programmable_switch.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_off00012c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C56 5476 bytes
SHA-256: 4e9142a88bdaaa6280e88a9a281be6de112474980c196b5722c162593ce5ac8e
font_01_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 10900 bytes
SHA-256: 2061af8a88deec68256f95137795f77e12ca37cf49b05f0da30a0d6f2ac62f8f

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