Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d0866090cee0de…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 02:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74802068da567cec3a73881efbde2955 SHA-1: 80a39a4b2c8787406e53e6e72065f37c4bd54e29 SHA-256: f7d0866090cee0de5368678a2e473b56de0342878a8afe4703ad1068129354b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or unknown domains, and is structured as a link farm. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates a high likelihood of this document being used to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://avenue102.com/uploads/file/guzisekanugetasugakos.pdf In PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/sovekipufamimed.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/14428707026.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/zapupaz.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/85529117090.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/bofasem.pdfIn PDF document text
    • http://soupworld.de/upload/file/83604018776.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/25098047924.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/0a2c28e17dc6c0edfb37da003093f194.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/5411746848.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/53138882576.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/wovomobipifozasodamavabo.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109111619272278.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/71527316633.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/jukisurodoxukekobizikog.pdfIn PDF document text
    • http://builderall.info/userfiles/file/13461898363.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/89463249399.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/vesube.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/30665834974.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/jufufo.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/pirafegaresisojekar.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161451754cc8c7---82694247322.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/monoto.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/65641906333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=frog+and+toad+free+pdfPDF 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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 17908 bytes
SHA-256: 8b08ca1a0bf5a84ca4fd7eef2dcd4d1336231dc8b165478cfa9214de2b299785
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 10344 bytes
SHA-256: 67ce7f4020cfb5dc78115e908f0107ef512f8e62c34a363219211d9408880c95

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