Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7b280abb00d3ed…

MALICIOUS

PDF

84.3 KB Created: 2021-05-27 18:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5e76bf0fe2b079255e9f0044dea13563 SHA-1: 111e6a16662c633313d600e6957891af3716ee0f SHA-256: ca7b280abb00d3ed402b40383a47bb79b3c05cfd27f30ac4b16f6e9b468e26e4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://leonvi.ru/strik?utm_term=kirchhoff%2527s+current+law+example+problems+with+solutions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384482/normal_5ff367e3e2ae8.pdfIn PDF document text
    • https://musagitunoton.weebly.com/uploads/1/3/4/3/134368320/fd7de2c7.pdfIn PDF document text
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/dde67ac235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384310/normal_6006a0fc69b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_600fe730eb90b.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/fixalujam.pdfIn PDF document text
    • https://povuwifapijolak.weebly.com/uploads/1/3/4/2/134265363/vonunuxaponuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_605fb621eef35.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/tugaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_6048606172321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_5fd1a38f4eabe.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/1230d.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/difojef-tetivedo-kafovejekib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461497/normal_5ff5be5feab03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368975/normal_5feb1f2192419.pdfIn PDF document text
    • https://gamidamivagug.weebly.com/uploads/1/3/5/3/135324690/dajiguz_morinanove_zivelaku.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/4ff74eddf138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_606a38613198f.pdfIn PDF document text
    • https://zinadilijisud.weebly.com/uploads/1/3/4/6/134619113/ee3b08c924c.pdfIn PDF document text
    • https://miruvogix.weebly.com/uploads/1/3/1/4/131408245/jebazunos.pdfIn PDF document text
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/4246357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493201/normal_5fe391757ce21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_602454038dc17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 5556 bytes
SHA-256: 70c0f6c23c5d814139c122ec89ff1748af2cb2fab5b71e3210cd0365576276a6
font_01_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 10920 bytes
SHA-256: 86b9332b987f4fbd134bcb55aab291476e59293e3fde93a886432e6994aa47bd

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