Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ad742f0f4bcbf9…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 04:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 240dbe28d1e0c4da234ff3a155853fa2 SHA-1: 7f98010dbceea02d509194c4cb6763bf01e21e57 SHA-256: 40ad742f0f4bcbf92037ee19fa3996e355bfa79e33c10d20e23dcba1ca0c58d2
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 designed to redirect users to potentially malicious sites. The presence of a 'utm_term=android+system+recovery+3e' in one URL suggests a lure related to system recovery, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://contact-house.com/fckeditor/upload/file/bubaxomepujo.pdf In PDF document text
    • https://nk-sostanj.si/files/file/15281704627.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/futobanogulubidini.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/rodujuzi.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/8274063979.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/78546521454.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/79870711422.pdfIn PDF document text
    • http://talleresjpg.es/img/file/niziwoberukolajisexexo.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/puzuwetogexikiwobatetap.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/92751377985.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/69061029496.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/85439806397.pdfIn PDF document text
    • http://candientushinko.com/images/file/pibor.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/77764302802.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/20316056880.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/75996576947.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/11699961190.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/93769153168.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/xotobepa.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/92172939909.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/43154244295.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/banumetufed.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b8a0b7658---54200342583.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca05a48a9---jibevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+system+recovery+3ePDF 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_off0000bade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADE 17864 bytes
SHA-256: fcbbbb638863907b7f7775fb6ac4f4d362914df2b615b4027e241cda052d20b8
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 10656 bytes
SHA-256: 6cf0fedb6951bf5ecef1be0d789704d2bedaac85563dca720f756221a4e3b68a
font_02_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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