Malicious PDF — malware analysis report

Static analysis result for SHA-256 73585030c46e6c0a…

MALICIOUS

PDF

111.1 KB Created: 2021-02-04 06:35:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b565f0885ed96b509e2fbaafffddb920 SHA-1: 800b1556168ead1fad9b1dcd4ee8ab1522423841 SHA-256: 73585030c46e6c0a0d996501741cf454d1e4fb9289aa867c4fd9bab546e59aa2
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. No scripts were extracted from this sample.

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/aws?utm_term=foldit+lonely+sheets PDF link annotation
    • http://prizinsta.info/frog_craft_printablezfyl7.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/derecho_procesal_del_trabajo_nestor_de_buen0v2hk.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/limexivejanulo.pdfIn PDF document text
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/3090e82e221201d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452374/normal_5fe060d9390c1.pdfIn PDF document text
    • https://jasedulenenude.weebly.com/uploads/1/3/5/3/135328633/xidenuzuzabuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_600f820ab5e35.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/73aae3e343b1.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/fe1be504e897fcd.pdfIn PDF document text
    • http://twoup-viktoria.online/77948134036ei22j.pdfIn PDF document text
    • http://helplnstagramoffice.com/video_live_wallpaper_download_appw23rr.pdfIn PDF document text
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/webalebuvutaze.pdfIn PDF document text
    • http://top-salez.site/videojet_manual_62100kte9.pdfIn PDF document text
    • http://wowitaly.space/76175695137ub779.pdfIn PDF document text
    • http://arendagg.xyz/khata_book_app_for_pcl2sc0.pdfIn PDF document text
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/478f19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001663d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663D 4452 bytes
SHA-256: 910c0811ade1c9eafbe06f5fbfdd383a06f95a57f22b11ded4b9d03ad20e8889
font_01_sfnt_off00017561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17561 12440 bytes
SHA-256: 00e014a8c4e076ce0614b8ee75d698f14baf0a78eda78163f0f5604d21efdc67
font_02_sfnt_off00019fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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