Malicious PDF — malware analysis report

Static analysis result for SHA-256 e616ab80fafc8e4a…

MALICIOUS

PDF

82.9 KB Created: 2021-03-16 20:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a8d4838c6a13201663532cb3c350a590 SHA-1: 04c3be588f8389ebcc14f7ff1a1ad476db67eb4f SHA-256: e616ab80fafc8e4ab81878ec3d3c1e8fd4bfc4bfb902e2c5fed7bde915493027
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as Pdf.Phishing.Trojan. The presence of external URIs and the link farm structure suggest an attempt to lure users to malicious or SEO-manipulated content, potentially as a phishing or malware distribution vector.

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://jacksth.ru/award?keyword=trastorno+de+ansiedad+por+separacion+infantil+pdf PDF link annotation
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/vafon.pdfIn PDF document text
    • https://gifofelonapa.weebly.com/uploads/1/3/0/7/130775883/8719b958.pdfIn PDF document text
    • https://jarubobukifali.weebly.com/uploads/1/3/5/2/135297267/foxiruwifakewexuma.pdfIn PDF document text
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/numaxaje.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/5a9c55514.pdfIn PDF document text
    • https://siduwetatipapi.weebly.com/uploads/1/3/4/3/134318549/7167791.pdfIn PDF document text
    • http://jilunagobag.22web.org/emergency_medicine_salary_michigan.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/84362898074.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/260065.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/nizutowuneluz_talagezem_babajimavazini_xulikozewezazur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_5765a5480ee941e2828b536fa645a56e.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_d51e46ff19ca410897b457f5e78ae7a6.pdf?index=trueIn PDF document text
    • http://jelunegizubu.atwebpages.com/lewezomaza.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_b247fdedfe0a4f038d080ea25a6d77f9.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_217063fa28f54eaaab891058b2b62349.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_38b0c5a2cbc749c68fc3c71f99d67630.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_9ea52e23e84e4c478ce2e2a9d5c4133d.pdf?index=trueIn PDF document text
    • http://jolenifetonami.epizy.com/excel_bedingte_formatierung_wenn_datum_in_vergangenheit.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_7a43913d51c4456e9e719bbc4c62f3d6.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_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 5100 bytes
SHA-256: d5276af1b5fec4c181ab7063ede528345359580578d1f5bc3b2d3b838f82fcb4
font_01_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 12324 bytes
SHA-256: f4c78abdce6a33ceb69465b3fe1dc66fa2c38470692b21378da8fcaa5de6c9ba

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