Malicious PDF — malware analysis report

Static analysis result for SHA-256 100c41f1893401b2…

MALICIOUS

PDF

66.4 KB Created: 2021-10-02 21:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2091fdb817da3d874f807e83981bb01c SHA-1: 09ffdfd8e2151abb6ab4548c298f8c3efe10edca SHA-256: 100c41f1893401b227579fb4048a6101cbc93c8eb6e1cb5bdb0c2b6a9fb6f094
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://autolavaggiocraparotta.it/userfiles/files/jazolefutezan.pdf In PDF document text
    • https://gkatsov.com/userfiles/file/4683530049.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/71080269924.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/tisixagenarukemavipixivo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/13095639113.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/wajezuva.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/6348018713.pdfIn PDF document text
    • http://dd-eng.com/files/files/3396232794.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614c972993fb7---5220981462.pdfIn PDF document text
    • https://castel.ro/userfiles/file/jevinaga.pdfIn PDF document text
    • http://abwessex.com/uploads/files/pogitemen.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/18510609972.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/zorezamasumuxalofiguz.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/safimuronowawaluji.pdfIn PDF document text
    • http://journalofcritique.com/ckdosyalari/upload/files/xozadufuj.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210917131059.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/a1f969cbafe437941c8c0d83b57706ac/94372464973.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/jolamofijomizoloxapek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+you+calculate+valence+electronsPDF 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_off0000a79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA79E 14520 bytes
SHA-256: 8263b48a9a2da156d7f99dba725f3bf98128188e6fb332d820140d8b2c527e26
font_01_sfnt_off0000cbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 10628 bytes
SHA-256: 4258c1b0b57aefa8a0fcd352e79fb72a54907d8f2f5c98ecedade87913b13050

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