Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd53d0bae7a4e14…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 06:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e75283d493d42e16aa8fd6f32e625ed SHA-1: 9b5ee9485cfce5183cd9b7261687a17d1269b660 SHA-256: cfd53d0bae7a4e14f3d7f3237097edf423e0f22141b2787edc6f5b9c81ca80d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the nature of the detected threat (Pdf.Phishing.Trojan) suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cozycornerexpress.com/uploads/files/zuwediselifaniwopalagejol.pdf In PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/12363978186.pdfIn PDF document text
    • https://tdfstore.it/file/74120656762.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/61871074674.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d9d182547a075047e3f0079378f23afd/duwowuvewinijuki.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/46560335726.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/75048902985.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/nonuxuvudenapasirav.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/rewikisolelem.pdfIn PDF document text
    • http://ewtch.com/upload/files/taposuvuvikofofax.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/47374337174.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7a266c50---56827086169.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/23588556749.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/57329894814.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92420657301.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/vegonudukukejomujusu.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/26774415.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/57424421077.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/fenomewikibogikegudix.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/topapuvipugusug.pdfIn PDF document text
    • https://baglab.pl/galeria/file/75413991950.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/tapuwib.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/73650089821.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/58960176405.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/soxuwulur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=last+day+on+earth+android+to+iosPDF 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_off0000caa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 17104 bytes
SHA-256: 71a58451718431cda0f0ff135bd24e51335dc9441885706661281addb6f437ee
font_02_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 10372 bytes
SHA-256: 3763e6d88948dac7fe47fa4f06fa5a04ea3a77e608cd4fdb3b30f8f29cb63064

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