Malicious PDF — malware analysis report

Static analysis result for SHA-256 859e766e05beafec…

MALICIOUS

PDF

75.3 KB Created: 2021-02-20 16:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6dd217756d0437cc7ee54e09308a8e7c SHA-1: d815b897282e519563f44fe296fdd06ecf7d4156 SHA-256: 859e766e05beafec769f77ff80e6cd9d1e886c1341a0d3bd3abbdf9b5a1885ea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though partially corrupted, suggests a lure related to formal letter writing. Numerous external URLs are embedded, many hosted on disposable domains, indicating a link farm or redirection scheme to malicious sites. No scripts were extracted, but the presence of embedded URIs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/123?utm_term=how+to+write+a+formal+letter+in+irish PDF link annotation
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/talolegozutoreweronu.pdfIn PDF document text
    • http://com-copyrighit.com/wojipifakuxengq3p.pdfIn PDF document text
    • https://domufebulas.weebly.com/uploads/1/3/0/8/130814286/sipotidigokujet-dizizeteroja-giwaxikali.pdfIn PDF document text
    • http://detonic-ro.website/7077667740551si4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_5fddbdbf75afd.pdfIn PDF document text
    • http://autobaff.xyz/mecanismo_de_accion_de_anticoagulantes_oralesam5x3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5fdc6cfd8417f.pdfIn PDF document text
    • http://ulekschool.online/godasekijibs17p7.pdfIn PDF document text
    • http://webmastervlad.ru/the_pact_2012_imdbn54kz.pdfIn PDF document text
    • http://vidclips.design/canon_canoscan_lide_200_user_manualljw65.pdfIn PDF document text
    • http://wacc-cat.org/biologiste_mdical_formationmaxbe.pdfIn PDF document text
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/271540be70748.pdfIn PDF document text
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/bede09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_6000688daef41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5ffcf9b381d89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumizasikoxef.rf.gd/52905849148.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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 5060 bytes
SHA-256: e1db7b326766bd1c2e79d57c8cf7b5c4b6e160fd40d5c850bfbb060fb1f123f4
font_01_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 10932 bytes
SHA-256: 85a3f5849f9ced84bc4ef9604aec25936650f10a9b71baa55427fec55271f8a0

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