Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e3aa1f6193bd02…

MALICIOUS

PDF

73.7 KB Created: 2021-03-13 17:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f4c7a2a888d94b3972819429294c2d94 SHA-1: f2af0d43cc6228d83e573156d89264fe60ba0804 SHA-256: 58e3aa1f6193bd02a28054ef54fbda35da5a64e86512def13300345d561526b0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document may be disguised as an invoice or payment request. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score point towards a phishing or malware distribution attempt, likely leveraging PDF vulnerabilities for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/award?keyword=school+accountant+job+description+pdf PDF link annotation
    • http://idealslimitaly-official.site/42225878866p18zy.pdfIn PDF document text
    • http://anrostore.ru/formal_letter_uk_englishr4nrq.pdfIn PDF document text
    • http://dostafood.xyz/43016677449kb69k.pdfIn PDF document text
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/rufopas-jujelulomoromur.pdfIn PDF document text
    • http://creditreportusa.info/oster_kitchen_center_mixing_bowlshcalt.pdfIn PDF document text
    • http://delaem-sami.online/driving_test_study_guide_canadanaqpo.pdfIn PDF document text
    • https://fidovasunub.weebly.com/uploads/1/3/0/8/130815093/sogogaxemuk_faxeke.pdfIn PDF document text
    • http://prolac.ru/lasuvovisifurijukesagi6mm46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5fe5bafc6c607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_601ae6d9b5887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5ffe506d8c1cf.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/9708248.pdfIn PDF document text
    • http://storezone.info/mokoluzim12i0y.pdfIn PDF document text
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/fugepugu-zijixetowuxus-lemufedon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_5fe8f134806c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_603eb9e4546ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a763ebd9-c18e-43e0-89ad-bff0d4d40701.filesusr.com/ugd/2e16aa_15d49040fb4c4cb6a19867cae08267c0.pdf?index=trueIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_f4ca93b21c05400eaca6632dfbbc907f.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_43fa9f580cfe40fcbbcb45e6184cf73e.pdf?index=trueIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_9f21bf2f720941acbd8a37c8269e821c.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 5560 bytes
SHA-256: 230a35db7b124d783db77b1ba9f6498b9d09bb488049903ff13ebac38341237b
font_01_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 10668 bytes
SHA-256: 449bff28d3cfb70596c10e92a854cf6e2f60924a27d800884ebe78f8cd05e542