Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d898d42d3084ab5…

MALICIOUS

PDF

85.5 KB Created: 2021-02-19 20:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9c87811b273c244d2a3d67be09f27913 SHA-1: 0c2881454a2498eab20a703e02157a1779bf1b5d SHA-256: 7d898d42d3084ab5f0c56b13f372a922e69e565dcc972dfb545c9143f0f4b0ba
186 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 trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for popular content, likely to trick users into clicking through to a compromised site.

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://maypoin.ru/strik?utm_term=watch+dungeons+and+dragons+movie+online+free PDF link annotation
    • https://zipadufemawosep.weebly.com/uploads/1/3/1/3/131398243/da18e678c.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/8496643.pdfIn PDF document text
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/28cf6ba7ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5fc816d33cff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426066/normal_600f79a3e2f25.pdfIn PDF document text
    • https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/afdc54bf6f633.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/9528fa4911b93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_601d966f6b382.pdfIn PDF document text
    • http://vomenelavive.22web.org/7535956673.pdfIn PDF document text
    • https://jikudirag.weebly.com/uploads/1/3/4/0/134040407/zimivenalizebol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_601148c11c8cb.pdfIn PDF document text
    • http://gadokuzepot.22web.org/planetarium_adrienne_rich.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/7727718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5fdef5e5a9015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxelisenaxoxig.epizy.com/briggs_and_stratton_6250_generator_manual.pdfIn PDF document text
    • http://remekos.rf.gd/gewaximuxanukoguredile.pdfIn PDF document text
    • http://pesixogid.rf.gd/vibidiwe.pdfIn PDF document text
    • http://kigexozuzexozo.rf.gd/plastic_roofing_sheets_bunnings.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_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 5508 bytes
SHA-256: c9c39793b60c1f916d95b60272026d756114a30f613413675d6d1bea8305669f
font_01_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 10492 bytes
SHA-256: bead6010a599ca7c85f2e8c931a0d113cfd00a2109023971f2945e6dacbbe361

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