Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bb23421cce911c…

MALICIOUS

PDF

80.7 KB Created: 2021-10-10 07:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 15a5bce06ccf303530c404b136a14748 SHA-1: a7913bf30ec0cd3aec2d73069d567ed1a4a9a6be SHA-256: a7bb23421cce911c045b0a7540837c0d7cdfd5df2e86409bb593e95cecb4931e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users by directing them to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://studiocalderini.it/userfiles/files/pudinusawuzid.pdf In PDF document text
    • http://photo-poligrafic.ru/ckfinder/userfiles/files/kizuko.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021925517466930.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/datufulij.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/40901521715.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vatezixi.pdfIn PDF document text
    • http://boki.hu/editor_up/74241388589.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/35369917100.pdfIn PDF document text
    • http://alvitraders.com/files/kabarofoxagumazuposem.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/feruvizabo.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/91050003563.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/22700757476.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fifemofefuloj.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/86108358625.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b51dfb81e3---97100069292.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fapizikinubatopur.pdfIn PDF document text
    • https://aspirans.com/files/file/jejumasoxixiribegek.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/41954553314.pdfIn PDF document text
    • http://humanlitech.com/files/files/71205436800.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/bomivuxaperuzemikamarelem.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/wibirujunoju.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/fodotodituba.pdfIn PDF document text
    • https://carlojans.com/cms/file/tanerilirufubuletuj.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/jobilajijajivukifok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=croutons+in+tagalogPDF 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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 10280 bytes
SHA-256: 68782d49ea783f06e1299a269a0ce043675a91ff3673474e8d9f43a77f045389
font_01_sfnt_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 18844 bytes
SHA-256: d0a8ead4205a96708487cac13c4ecd6fd6d7398e3c6bdd607d9621e48716b2e4
font_02_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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