Malicious PDF — malware analysis report

Static analysis result for SHA-256 1639a80bf3c25f48…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 21:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4d4a8b4a02beb392ddf387e0741ea10 SHA-1: 88ac3a28084cdc9323ab99a8ad8d02da2fa3148f SHA-256: 1639a80bf3c25f485a192ddeeb684ad39274a502fbb56de6d5d6151654c0e59c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=windows+phone+apk+download PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136326ac25a6---nuzetamev.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/99228653698.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/38939613168.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/2430714586.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gororuxagijaxosipakux.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/23564252921.pdfIn PDF document text
    • http://glassick.com/userfiles/file/divukafege.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/namuxib.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/68426366218.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/27553002726.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68909531732.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/mafinokijiro.pdfIn PDF document text
    • http://weldingplaza.com/files/file/70579929146.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/69566468993.pdfIn PDF document text
    • https://e-midas.ro/files/file/powelefikigumudebokim.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/48442240230.pdfIn PDF document text
    • https://solturism.ro/images/file/dupunonubozi.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/vafefivo.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/78000001369.pdfIn PDF document text
    • https://defi128.com/userfiles/files/vujigobok.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/71928216740.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/99546155455.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/vagobebaduwujaxazug.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/rozimezezarefifumawuf.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_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 17876 bytes
SHA-256: 46442e1bad48e52624ad9001c20630c1311f2f9eb2c32b1af3a4b85842886192
font_02_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 10460 bytes
SHA-256: 224c76c9532f6bb185c8664dff800abd4dedf06d0f5cf5fcbe6aa949cbabd8f1

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