Malicious PDF — malware analysis report

Static analysis result for SHA-256 622e16cc1e9ef615…

MALICIOUS

PDF

84.4 KB Created: 2021-03-11 06:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 66ec507ac82c82c7dcbc76e4037c5c6d SHA-1: 9feb2f41b6aeec3e7910ba0c48828e06aa232fbb SHA-256: 622e16cc1e9ef615c0d9a1967187c8f3f314beadd2c655b60da4689dc485fff0
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs pointing to suspicious domains, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The document body, though heavily obfuscated, contains keywords that might be used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/award?keyword=caballito+de+mar+reproduccion+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453718/normal_6007c52079567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5ff8d4f48cf64.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/fjcjdji/xibekonel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fcd3d8fb5c2b.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/hdCQheO/vuvalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_602e553f45f77.pdfIn PDF document text
    • https://cdn.sqhk.co/luzeginu/Oibgfge/78606870000.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/Sic0fbV/powebutukubude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_60301fa7acd5f.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/jjbgcFh/tezekesuzuwupumibum.pdfIn PDF document text
    • http://logunej.iblogger.org/tenuwubejanofadajadiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/tkOijhg/31294283855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riromazadejiwa.rf.gd/98506258165.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_ead9ab641fac45f0aa20bba0a956e6f3.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_5adf080ab58d4b8db5d1c07215c5edb7.pdf?index=trueIn PDF document text
    • http://fonisojodivese.rf.gd/57341034710.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_db9ec745e87e41a8873bf5ee46d5a523.pdf?index=trueIn PDF document text
    • http://xivajaraseb.rf.gd/92807929701.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_b9bb5827213d40b2b4ec5d1853853965.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_571251bdd26b4998b4e58deecc27fc0f.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_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 5168 bytes
SHA-256: deaf892fc2bb1a36f7f75059130f402a6e9a8757430a22fb148ec89cc4a7fd71
font_01_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 11748 bytes
SHA-256: 0dae5b7b08bc9d10f67fc2a5076a926d8327f9900d2f065b29bb98794a19b6bf

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