Malicious PDF — malware analysis report

Static analysis result for SHA-256 143343e62c687acf…

MALICIOUS

PDF

74.3 KB Created: 2021-05-14 18:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e3d4394e2f220948485d60be7dfe5ec2 SHA-1: ee82a43a8daa3737f57724e903f7dae63637dbc0 SHA-256: 143343e62c687acf4527f0264be36d0a2883fbc0cc6378f2a08f440c54c71ece
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file contains a link farm with numerous external URIs, including one pointing to 'baarspo.ru', suggesting a lure to a potentially malicious website. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs indicate it's designed to redirect users, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=company+health+and+safety+policy+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420039/normal_6058106cc1602.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/eghIvhi/81748655231.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/jjahiih/tebojijixeliredimuzeparel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466408/normal_601fce2b69863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369503/normal_600596ea4ad3a.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/iBfhdZ2/photo_gallery_hd_editor.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/ifAZ1jd/57557378733.pdfIn PDF document text
    • http://folejaf.mypressonline.com/toddler_activity_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_60663bee78d45.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/gjhidx7/nogukelasekumojikozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_601f219cc9ed2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_201b97a2a98b4060ad5eb15f0b8b2393.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_863b5d63dc1b43f9836d5bf3660f7718.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/806ae266-266a-49b3-809b-6f137b2499d4/the_worlds_greatest_blackjack_book_en_espaol.pdfIn PDF document text
    • http://vidoniwofunevan.onlinewebshop.net/biotecnologa_ambiental_francisco_castillo_rodrguez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9fbe69-4306-4677-9ed6-b59b0fdc3c45/fudelevojubarek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910a472e-e389-46b1-b8b1-3860c535e4de/64749314238.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_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 5304 bytes
SHA-256: eb7ea68dbf1e60a3d3cc9d8a7c4847e1de9aeacac7b3fb212fff0b74daf6a648
font_01_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 10656 bytes
SHA-256: 496ca26fea7fa8ccce4092b1423a7fb729d0961a38a446c745595671061df31e

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