Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a69fdff415208f…

MALICIOUS

PDF

68.7 KB Created: 2021-10-04 02:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8924b183c653f297822714bdadc013c3 SHA-1: 7a17871d0602d233c598600b205f72c315caee1d SHA-256: f5a69fdff415208f4d1ca51d5594f8aed9f4f7771fad66a83c1e1ab0dd10bf2c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://ouhkpthaa.org/userfiles/30589699558.pdf In PDF document text
    • http://agmapure.com/upload/files/kulev.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/8533007558.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4f70140e---motusudinugal.pdfIn PDF document text
    • http://email-database.info/userfiles/file/selimimakonoxiv.pdfIn PDF document text
    • http://chieucoingason.vn/files/jikevewurupifaki.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150afb3177f2---29748492659.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/99928323810.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/80203333336.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/kufineto.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/80285946768.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/gosalulo.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/nagefaxigegagevapufow.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/46649620604.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/28494540898.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/39431271942.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/29009749474.pdfIn PDF document text
    • http://standardamulet.com/files/files/rized.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/57834593261.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/49226700068.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/sebibaromijadiniwivugipo.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/dodupitukanelabaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+stop+baby+from+overfeedingPDF 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_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 11192 bytes
SHA-256: c9ced7ef59f9f1855fc6c304112be903b1e8408cd82fe7474ec31ca3928a0c30
font_01_sfnt_off0000c9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E8 14148 bytes
SHA-256: ee8c9da817ca40ea0fc37365edd5a2f9552ab5edbb2563837c4781e5d05178a2
font_02_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1