Malicious PDF — malware analysis report

Static analysis result for SHA-256 f427c04a1612030f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 13:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6cf4722d1f7c2025a848f1c39cc6828 SHA-1: afbd30c4d72ebf559ad81720c16977bee4d0a07b SHA-256: f427c04a1612030fdb76c49d2586c5dcf949bf486207dbd30de204e29994d3a4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate it is a link farm on disposable hosting, with a specific rule firing for payment redirection lures, suggesting a business-email-compromise pattern. The embedded URLs likely lead to malicious content designed to exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://smidgel.ru/uplcv?utm_term=free+android+phone+spy+app PDF link annotation
    • http://mylodge-naoshima.com/11081091094.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305494ef983---wasaginubegasij.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/lubivizalozojowifuw.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/menafazekizulen.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/46068672998.pdfIn PDF document text
    • http://nktrading.qa/file/files/mukinagabutineg.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/19188743009.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/dukogamonikotapew.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/83971557200.pdfIn PDF document text
    • http://praguetransfer.com/files/file/riwanufodonul.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/fe468cbb638b68191204182f25529b91.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/7838237456.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/23248242279.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/62244080609.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/kolosuvitif.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/68882048435.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/juwepozexogoxav.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/17230301620.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/41536842845.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/7543716704.pdfIn PDF document text
    • https://o-dance.com/upload/files/41653575293.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/nogadalu.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 10436 bytes
SHA-256: 5a9e26645b6782285183ef5b8968a173f84ba7f4f5cfa84beccb009d68ce4779
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 78307699cf32f1932813986bf873c507e585eb50b08e5796cad82a15ad6c0cca

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