Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7b60fcaa197382…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb2a24f72be84b3e021d043aac310e17 SHA-1: cc8330c554e458504fda73e67f4431bb0c64a654 SHA-256: 7e7b60fcaa19738295791e76305c141951e5ae031f7c97369df1d780aeaa73e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or are used in a link farm configuration, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=how+to+use+android+apps+in+windows+10 PDF link annotation
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/rabitujezolenekaw.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/tapozulejotoxowunemav.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a34595a9---tesininefowotewof.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109100505086960.pdfIn PDF document text
    • http://netflor.pl/upload/File/tejoja.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/bagibijamimiwijotijaba.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/gimeruzu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/viragida.pdfIn PDF document text
    • http://wawa757.com/uploads/files/sajugezezexejigotuwi.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/43112242279.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/93535449917.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/fiperagajexiwatuvofokumub.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/jariwuxesedupeked.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/kefilopewakovuf.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_024528.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///77726842352.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/boxerodak.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/magozika.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/84880337679.pdfIn PDF document text
    • http://robbes.nl/media/files/41637468699.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/zepivamenaxunik.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_off0000d181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD181 10688 bytes
SHA-256: 744f6f9e0fbc832daf5b17cde976573695fd87c8730c0d6f298c4638f492c96c
font_01_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 17184 bytes
SHA-256: 4cc30831bec17f959a218302cb7f507fc205008ceb518f28a58501d7f2ca3401

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