Malicious PDF — malware analysis report

Static analysis result for SHA-256 128b4b76a53a2c37…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 08:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29a709d48f55c3cf00679f755610b212 SHA-1: 82e21958edb5a31650d4bcb4cd25c398c3880e2b SHA-256: 128b4b76a53a2c3748f0763d719ecc813699302e7439830d5591b5f919691bcc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to various domains, suggesting a link farm designed to obscure the ultimate destination or distribute malicious content. ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://soles2walk.cz/data/file/98919178798.pdf In PDF document text
    • http://elitaliaweb.it/upload/file/54241361830.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/nikosamibunaje.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/31094823776.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/manokojomotepe.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/nozijora.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/5571607075.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jajigikigexuzomok.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zalal.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/repakopufaximegixamid.pdfIn PDF document text
    • http://osayit.com/images/file/81360969934.pdfIn PDF document text
    • http://anpharma.net/upload/files/sizaxufolaxop.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/61168392955.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/wumilujebuduwarewup.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/rofazisa.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/xowesuf.pdfIn PDF document text
    • http://skupka23.ru/upload/m/lakiputemo.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/viziludelotiduridon.pdfIn PDF document text
    • http://eva.am/files/ccd17478dfe64d29.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/ginafob.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e19734d6d0---tirafebuzed.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/67683490227.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/75985417300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=stickman+simulator+battle+of+warriors+mod+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF99 11272 bytes
SHA-256: f3502da9d8df89ffe7da84f8d883f07a971d0c5f35d777c7054a99aa06b651bb
font_01_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 18724 bytes
SHA-256: 39db521808137545eca5cebe82cf64008205a956c6fbeacb15538d801654518a
font_02_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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