Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbef398c6ff444d…

MALICIOUS

PDF

84.0 KB Created: 2021-03-18 07:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27c621a3e24bddfea3c7e85e269d67f4 SHA-1: 9af1fad670129a1f9ee8da72b8074cb7b8ab8303 SHA-256: 9dbef398c6ff444d5bdccb11cb33abf54b7879c56688855905d547a8d6e84db2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm designed to distribute malicious content or phish users. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=que+es+el+pronombre+relativo+en+ingles
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/siwezusovuse.pdf
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/8fdbe38a3a957.pdf
    • https://cdn.sqhk.co/lodoseduler/RYyx76e/is_the_whipple_procedure_worth_it.pdf
    • http://gugolufixa.mywebcommunity.org/zolofi.pdf
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/f408ed07009a0.pdf
    • https://cdn-cms.f-static.net/uploads/4380228/normal_5fd8893f1e046.pdf
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/8802526.pdf
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/metejo.pdf
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/3580650.pdf
    • https://static.s123-cdn-static.com/uploads/4390995/normal_5fee83473112d.pdf
    • https://cdn-cms.f-static.net/uploads/4449630/normal_60260e1a8c014.pdf
    • https://cdn.sqhk.co/mivuxakadu/CrzPijY/70022631186.pdf
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ffd251f2e355.pdf
    • http://rowowevu.mypressonline.com/stannah_stairlift_420_service_manual.pdf
    • https://cdn.sqhk.co/farafakilof/iqTMheJ/vodupagagexejajugozi.pdf
    • http://mazipuvaxa.mywebcommunity.org/59595272468.pdf
    • https://ximizewilaxeju.weebly.com/uploads/1/3/1/3/131381769/fojis.pdf
    • https://cdn.sqhk.co/vawerowosuw/gjZgjhx/chapter_2_cells_and_tissues_packet_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b582d363-e4a6-4a57-93e3-38af2bf59538/wixirawenabe.pdf
    • http://ligujizulogi.atwebpages.com/definition_of_sickle_cell_disease.pdf
    • http://gozuketitara.onlinewebshop.net/how_much_is_a_2015_honda_accord_exl_worth.pdf
    • https://uploads.strikinglycdn.com/files/9d680037-6607-43c4-b4be-f4d75df57703/how_much_do_interior_designers_make_in_india.pdf
    • https://uploads.strikinglycdn.com/files/1f8a5cc3-54ea-44b6-af91-aa237d439215/35828503124.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f102.bin
0f33e12b0dbd1b289278302ebcf50c7ab9139b32e441564ba53141d4393d79ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 5400 bytes
font_01_sfnt_off0001034c.bin
58207e6ef9a30c24766ad4b6500052ff3716c8c245f83665e81a94cfc1a121c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 12236 bytes
font_02_sfnt_off00012b52.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B52 16204 bytes

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