Malicious PDF — malware analysis report

Static analysis result for SHA-256 f176bb9c3055234a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 09:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ddc2f35624cf8a9487795d3466de02c9 SHA-1: ead513df00f801af5fa548525bb29c91eaf17df4 SHA-256: f176bb9c3055234a5983022eadcaa2cea0090f9b1db6fcfe3b1d38baace02e3b
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosts, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pasarantogel.com/contents/files/16051498622.pdf In PDF document text
    • https://samudra99.com/contents/files/22974745824.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/13456280990.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/11077200385.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/sijogepiwirosoxubozumuten.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/resezususifegan.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bakifela.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/78158363407.pdfIn PDF document text
    • http://juha.be/_files/file/tegixusur.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/92960072769.pdfIn PDF document text
    • http://come2menorca.com/images/file/pafutolebelagosu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/basujezoked.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/walokeniwiza.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/zasugopuge.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613366214273a---1496624655.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/34681580491.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ridow.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/27168496571.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/majulolirojozuku.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/81950793849.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/mofepi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9fba238cf318ce9b2bc532c6125ed200/68346442602.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/bobukefutopuniveborafis.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/27429496768.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/20448144391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=shareit+latest+version+apkPDF 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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10584 bytes
SHA-256: 1a579b7d29dce423de0b216e9e8136e6c0a5c2b61555dc396c37e4c917143326
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 19724 bytes
SHA-256: dfb88122dc2e16b6a2a17a4399a18ad5fced4a2ce0c8068a2792460aa9fc695e