Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdf055bf5d80871…

MALICIOUS

PDF

79.8 KB Created: 2021-04-01 01:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449728b90ebf9c04e87029cecc4c3c61 SHA-1: 411506908b365bba3bb29963fc942337861310a7 SHA-256: 4fdf055bf5d80871c0c31097fb8919d6da7807656b12123a3a7eace731e735f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to "marie antoinette antonia fraser pdf", directing users to external URLs. The presence of a large number of external links indicates a likely attempt to drive traffic to potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=marie+antoinette+antonia+fraser+pdf
    • http://pixodizelevow.22web.org/xidevuzojikefagufogagon.pdf
    • http://amaryllis.space/the_canterville_ghost_summary_chapter_wise_questions_and_answersb0qyi.pdf
    • http://kulokozataxat.22web.org/lily_pad_writing_template.pdf
    • https://dowizipolejufu.weebly.com/uploads/1/3/0/7/130775784/314bb4545585c.pdf
    • https://cdn.sqhk.co/venujotiwufo/gehchcw/29540990656.pdf
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/roponudi.pdf
    • http://matroskin.space/83001810345d1ej8.pdf
    • http://sy0n.icu/how_to_set_tekonsha_p3_brake_controllerb6auk.pdf
    • https://cdn.sqhk.co/mujutuzidip/iarChaj/desert_prince_runner.pdf
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/nodavexotatini.pdf
    • https://cdn.sqhk.co/jeporikate/Mjehaqu/10841026727.pdf
    • http://funomixukipiv.iblogger.org/beeswax_sheets_for_candles_canada.pdf
    • https://gusijanuvo.weebly.com/uploads/1/3/0/8/130874241/wevez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_e4b165edbb8345a98b0aae63d6a57102.pdf?index=true
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_652b0aef40744f98aa3829810daff0b5.pdf?index=true
    • http://naledabizozede.epizy.com/34302361894.pdf
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_30643e55d26b4a1a893490c41d4d83d4.pdf?index=true
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_ebec86a5720b4f9ead00cf859e6efecd.pdf?index=true
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_e5a85690b5a0481ab45651ee4e05de52.pdf?index=true
    • 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_off0000fb48.bin
5cf53a3a7061192c4a810ace4ca4714988dfc6e08cd93fc29cdda26dee4c2e7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 5008 bytes
font_01_sfnt_off00010c6e.bin
429891a27e3e0e4ddaec6f228a08a1c9ca1beb3108cf48c6d8ba1cdf9691f6f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 11272 bytes

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