Malicious PDF — malware analysis report

Static analysis result for SHA-256 8704b5c44ba8302e…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 10:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 53addeef29d4280b3fa1dc48335d1f20 SHA-1: fa044ed01539cbb6b472541f358cb3c67976e47c SHA-256: 8704b5c44ba8302ec87a257e6e52d05cf6246900c5c2e42763c413d73a78a5a3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=logitech+z-5500+price+india PDF link annotation
    • http://extraevents.ru/87920758924bxvl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_601d5ae4a3d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_6039fe71a7cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_6056437da5959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_60468436e04fd.pdfIn PDF document text
    • http://vezerfa.xyz/50532505385aiz78.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://qiwi-wallet.online/fiddler_on_the_roof_musical_song_liste17la.pdfIn PDF document text
    • http://putinoid.ru/pubuvuzigomalaguxepimiboar5x8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_5fe616e6464ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601a8127747cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_6050c595d6828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_601c749541436.pdfIn PDF document text
    • http://setlyb.online/brother_hl-5450dn_printer_drivergoyao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_69dd64316aae42dcbea5352c1b0a85d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/76512016417.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_df1bf57cf2f84b7997ee45a62c5e9acf.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_c4901daa749a430db6dee2147a63c76b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/60480425385.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/8922253419.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_41f4283226264d74a4993e324b3db8df.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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 5412 bytes
SHA-256: 57f03644810038d4aca7188b6c7e315180896d20dc9271eea0a7a0c841b3a084
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 11392 bytes
SHA-256: 6d9996bc8721551232763c78b1e72e3eb4efdab960498dfac3a5fe5067efa801

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