Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd72fffd260f215f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 03:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8748d649fea5819ca231b1daffb9a02f SHA-1: 0f69cdc3cd19eab132007a14ffc57557360a8043 SHA-256: fd72fffd260f215fe4a3b38fa786a055878846d55a3d59830e0545a3c8f74bb6
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one that explicitly mentions 'fake otp sending app download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as a legitimate application. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

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 https://huntic.ru/uplcv?utm_term=fake+otp+sending+app+download PDF link annotation
    • https://ecpa.fr/uploaded/file/rilubokoxogojuki.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/74541552817.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wotajifof.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/gubib.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kogofosujitibe.pdfIn PDF document text
    • https://premiersuli.hu/files/files/82094806985.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/88728712611.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/71591964775.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/tewulujobilavisib.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wajumovasebajotuviwot.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/10/19974793392.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/20410344822.pdfIn PDF document text
    • https://termoformat.md/img/files/wojuke.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/luzodituzusoz.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/84702149605.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/memugolegowide.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/39629324811.pdfIn PDF document text
    • https://csn-alliance.com/data/files/muduvapil.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/masezamajavomefaw.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/woniwubifosogizami.pdfIn PDF document text
    • http://smogy.ru/files/files/silolidejalen.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210908152531.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417506251c2---kurusadozosakesijuxi.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/16499654546139234fcf8ba.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://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_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 17952 bytes
SHA-256: a40ba1dc7262d66cb9ee68ef37754271d8fc146ac78d1e7b8d25489afcba7ef9
font_01_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 10624 bytes
SHA-256: 9fab6e0c0523b9b8091c3cf700244fb7f400aa3ec7849de4e7f4a69947ef6e58
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1