Malicious PDF — malware analysis report

Static analysis result for SHA-256 77872ab2fb74f882…

MALICIOUS

PDF

74.3 KB Created: 2021-03-04 12:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ed2fd8806e08eb91aad25bb3ac67d4a3 SHA-1: e0d2cce3fe73ec52712351535c8e895eba2f6b64 SHA-256: 77872ab2fb74f8828348e562dd6a0aeabe5078152b3084f3e622f71cea8a30d5
186 Risk Score

Malware Insights

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

This PDF file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

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://botokaw.ru/aws?utm_term=what+is+rice+to+water+ratio+in+rice+cooker PDF link annotation
    • http://fesufobototezer.mywebcommunity.org/37837706068.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/61548482419.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/jamudixefiwivijovij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_602e3a12d5184.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/tfs_2015_software_requirements.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/dowobuwene_xibalox_vixagofipo.pdfIn PDF document text
    • https://lapokatodulobak.weebly.com/uploads/1/3/5/3/135347459/xawutokex.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/nJiiRn8/77945797135.pdfIn PDF document text
    • https://noduxexoretan.weebly.com/uploads/1/3/5/9/135993764/1538694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5fe45d66614f5.pdfIn PDF document text
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/5717569.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/cSljhsd/40969822655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/hourly_calculator_timesheet.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/xemutowotajajojupul.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/how_to_install_netgear_n150_wireless_usb_adapter.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/gakepesetin.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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 5024 bytes
SHA-256: 1cff7a26331fb19bd1b806e08789476e8eb5414b5270526740ccdb3bd3b7f726
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10468 bytes
SHA-256: a9ea062a462180562b2a8f039fc830a9346b739d89b40ad85e5c49af9c27412b

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