Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c6db16ce44149e…

MALICIOUS

PDF

75.5 KB Created: 2021-06-02 11:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1935f683c4c7e72274c0eeed09b27d14 SHA-1: 17073228d2e3e4c7fc385d08d149a91b73a17938 SHA-256: b4c6db16ce44149eb715266154f332da7147aa27c2bd501b73d78fa9c069ee2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The PDF contains numerous external links, many hosted on disposable domains, suggesting it functions as a link farm to redirect users to malicious sites. One prominent URL, 'https://garglob.ru/pbw?utm_term=how+many+volts+is+a+riding+mower+battery', appears to be a lure for technical information, likely leading to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://garglob.ru/pbw?utm_term=how+many+volts+is+a+riding+mower+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420240/normal_602f499761a97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453115/normal_60044a26f1d49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_605f9f76aa1a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_600fd2417ec42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_60297c7fe9e4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_6021243bde677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_6052323038712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388181/normal_60066976f175f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412181/normal_60080f708cb1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_606897b335965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5fdcbfbf13e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_60665ccf371ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_6053e96f152c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144486129/carta_para_deslindar_responsabilidades_de_trabajo.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144462081/nozovemodane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32150cba-2aa3-4bc4-ac49-fac4a74052cd/how_to_reset_toner_brother_dcp_7065dn.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144487614/dynamics_ax_365_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de6ec33-e74f-4b33-83ba-082ebcc2e4ef/rafifino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e86f95-dce2-4b57-8713-ee8c5bfcf3d7/ditewile.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144487686/73462207053.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/how_to_get_25_000_robux_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dd227a-a9b2-41c3-9987-9f0274c23d53/xiwukafawijanaxulaso.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_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 5500 bytes
SHA-256: 5130d7f29f94246b8a1de581abb37a2a283d4474167959af06d703e2097f8459
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 10628 bytes
SHA-256: d61474d4f86259738fb91a504caf0fa6704c012f4fd36e214c1f7d9769f27fd3

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