Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f362fd05b501073…

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 20:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 798bdd1677ee7c1735235f936fffb5e8 SHA-1: 038f1928cb29ee8245fe3afb5e6e043c8fb49e3d SHA-256: 1f362fd05b5010730947297eceb9ebf3a16469d794e608a89a2637e11441af3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it's designed to exploit PDF vulnerabilities or trick users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dorfadvertising.com/ckfinder/userfiles/files/91748452481.pdf In PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/2161289473.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/befataxotutoje.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/65708540253.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/nekeleba.pdfIn PDF document text
    • https://ubranni.com/uploader/files/penilukudinebozuzuba.pdfIn PDF document text
    • http://zaiger.ru/img/file/28276211530.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/nedibamumatapudavalulep.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/dubufezuxasudoreg.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/77878053426.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/nomopenutakuwesexodo.pdfIn PDF document text
    • https://alexspa.kaszebe.com/userfiles/file/2571016704.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529413a7445---binasupizenal.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/supurepi.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/fixeluganafazusiwesutelew.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/xusifebuzulusegelo.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155678ae86b7---rojedamosasiwova.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/68880689793.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/18068991471.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/20282873699.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/94384804144.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/26731234054.pdfIn PDF document text
    • http://domario.ru/userfiles/file/37297553709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=all+the+care+bear+charactersPDF 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_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 10132 bytes
SHA-256: 9eb1b1d4fc12cff0ddddaf7e0e43f3a473b6968b0540fb51be628a65c11838a0
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 17312 bytes
SHA-256: e81f612bf278880e783b859e85ead452f77e2e685b968023c423e41ad023cb30

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