Malicious PDF — malware analysis report

Static analysis result for SHA-256 c973876ed169abfd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 19:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61f22a762d14da9726eff908797fd5cd SHA-1: c7fc733b476bef13f69862c4207ebfc6a1e65ba1 SHA-256: c973876ed169abfdd0ef3290cf0854c9859ce9466dd1ef9fa643458bb305a9bc
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 embedded URLs, many of which are part of a link farm hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect the user to malicious or phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://molenat-energies.fr/molenat.com/images/editor/file/viluwer.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138a38e04102---binelatuxeviviwuxiw.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/rubilemiperaxikasezubaf.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/17811784041.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/mebozadafadofabomorakow.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/80591192023.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/45872526242.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/siduxulanurifi.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/40490139593.pdfIn PDF document text
    • https://energooptima.hu/upload/File/68878510032.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/69112369832.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/vetezufedu.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/kuvakilinolifisebugaselib.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682e5e657b---gapafowuzerusigoxu.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/72755110866.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wusegawezeb.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/70462671368.pdfIn PDF document text
    • http://bulmarconsult.com/files/gewupasisidokepituleto.pdfIn PDF document text
    • http://vhshf.de/File/13005371365.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/puwafipotozapalewaz.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090605483673499.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/65328525389.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/dedilujorewipiriwosako.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/29101937809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=structure+of+bean+seedPDF 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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 10644 bytes
SHA-256: 53bff3eac8d5f98f5212d46a1dba01ead23a7f6134cccc5544173da705e0ed8a
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 18580 bytes
SHA-256: 2b989b186768429102064141a16255e910c436c19efa366dea098354e111f82e