Malicious PDF — malware analysis report

Static analysis result for SHA-256 500d728d97a0a6f5…

MALICIOUS

PDF

80.7 KB Created: 2021-03-11 14:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a8c1668830ec76e5412bb233af65495 SHA-1: 192abdb12a9d550bbe710537aac7dc82a2297e51 SHA-256: 500d728d97a0a6f5adf8ed68c6b52f410ac582d7b46581b46c32a9b18eec38f0
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving spearphishing to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/award?keyword=gcra+bursary+application+form+2020+pdf PDF link annotation
    • https://zagajewogumemos.weebly.com/uploads/1/3/4/6/134627596/lewuwunelifamu-subewer-wovub-vixanadagofef.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/gloomhaven_rulebook.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/jinoweze.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/how_to_adjust_g_shock_5081_ga-100.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/1152299.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/QhihaLX/bloons_td_battles_meta_2019.pdfIn PDF document text
    • https://xifutasuwisesa.weebly.com/uploads/1/3/2/3/132302919/0771fb134b.pdfIn PDF document text
    • https://lukajupuxeburi.weebly.com/uploads/1/3/4/6/134630189/xamatebu.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvuxemoguf/hjjhZVw/46410577359.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/cssJiiA/21681169007.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/0EjgihW/zuvigud.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/velolal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_f93fc493f7a440168381eae0d8e86f52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/85588948965.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_738e8af7015e43458aa136b38dfe2ca8.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_b3aaa3b20e1742a0996bf9137cc0d405.pdf?index=trueIn PDF document text
    • http://jagomizaf.atwebpages.com/73809746082.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_f13859a5a8304c019d95234eae15c7e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovetijif/9512068521.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_9bd964fda5b846569f94cdbc58348828.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_24d0db4af0e447749349b2fdc8feb8eb.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_bc22cea89c8344cd8c7e8104de67dab9.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_15795b8db5c043218509ef2ccfd54186.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/night_owl_wired_camera_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/majokuwuvinalalerunote.pdfIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_91449698296a4e749446e29f487cfeb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/22527584752.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_cf82e5434e0247aaa39fe263efcdc894.pdf?index=trueIn 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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 5848 bytes
SHA-256: d5da98523d16ec88c46c06f0f401a81392a2e03d6a82c6caae6124128a20a4b5
font_01_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 10704 bytes
SHA-256: 2326eb379a4ecec60a1a1dcfe98e95adfc3db016a2ca2eaea0b5212c1fb58f97

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