Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a48c75239bf0ec0…

MALICIOUS

PDF

81.2 KB Created: 2021-03-09 06:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51d52aebd1e850dbd5e12b3990cb9b37 SHA-1: 68e4ea438b812ba1befdc3bab72c85b5015f36a4 SHA-256: 9a48c75239bf0ec05252e23db623b5f522942900a2d04f932ee77ca21ae92496
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://soxebez.ru/wix?keyword=troll+face+horror+unblocked
    • https://cdn.sqhk.co/nuwalimo/Ziejeuq/40968631303.pdf
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/pemelowogi-luvor-zapelidon-nesavuvizotuziw.pdf
    • http://instapresent.site/905117470038t2a9.pdf
    • http://senteber.site/juginagemavilq70f4.pdf
    • https://cdn.sqhk.co/vetelojid/0hdggoJ/5890461240.pdf
    • http://nukicew.xyz/where_should_your_pulse_ox_bewx62w.pdf
    • https://cdn.sqhk.co/gediwuwanol/djfNghP/zudogefuzejuzisumaf.pdf
    • https://cdn-cms.f-static.net/uploads/4451574/normal_60190cf83d9ad.pdf
    • https://static.s123-cdn-static.com/uploads/4376875/normal_60000a277ef37.pdf
    • https://pujipefudaluxaj.weebly.com/uploads/1/3/5/3/135318318/83b5b.pdf
    • https://xubawiki.weebly.com/uploads/1/3/1/1/131163512/wikoguzojire_mubisexive_sawufubizu.pdf
    • https://cdn.sqhk.co/vixivizal/W7igigp/crash_landing_3d_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zomuzigo/67914239537.pdf
    • https://s3.amazonaws.com/paxunu/orpheus_in_the_underworld_music_sheet.pdf
    • https://s3.amazonaws.com/vabedafozo/zavibizovamiliwozale.pdf
    • https://s3.amazonaws.com/vofadoloves/asfixia_neonatal_2019.pdf
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_91051ab92a9d4a268d5b3eb33b8ea4ab.pdf?index=true
    • https://s3.amazonaws.com/tetofamuxulil/wallpaper_background_hd.pdf
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_57ef2180497d41499fc38ae5d214d844.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_off00010108.bin
10a9cf8010ab89f10036cc634ddc1de8828b5ec0bd24151229bd89e56f371160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 5084 bytes
font_01_sfnt_off00011245.bin
b67bfd0111804a4da252b1a63b28a2faa749c597da936fb9e97a05a53b0fc3b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 10800 bytes

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