Malicious PDF — malware analysis report

Static analysis result for SHA-256 205879f8c4120f7f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 23:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd6cf4ae5d7ba613c242623aeeb13d9c SHA-1: 83e4afcf831837225d1e16ef1abfc5d8fb58fd88 SHA-256: 205879f8c4120f7f3218fb05fbd27c842797ae6ce65af98abe81d4bbdbd66e59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs, many hosted on potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to distribute malicious content or phish for information. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oqfur1mpr5fatu22fobf0qkjlt/91801868265.pdf In PDF document text
    • http://agarimo.com/archivos/archivos/fixozetovoxukixidudikaw.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/sazudofejis.pdfIn PDF document text
    • http://www.bash.cl/media/file/xudenatinopiruseripib.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/26324466655.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/doromovobisagerite.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/fudogafebazuwuvifolifam.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/28666714723.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/kivuruwalijadupugaxigu.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/wopafimuwikivesalom.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/wowuba.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/28841131010.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161309ed88ad16---pisasuma.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/32745107714.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/bezawikej.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/44283385872.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/zafijaju.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/dotajulapop.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/dabunexuzasumagoxefop.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/11443043673.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/35563315229.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/luramowimimoroxe.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/75865322963.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xoraduditiliwakugutu.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/gojojaniletuwupakifowas.pdfIn PDF document text
    • http://nktrading.qa/file/files/28732074838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=contabilidad+intermedia+2+joaquin+moreno+fernandez+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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 11216 bytes
SHA-256: 75dd63975921f8b4ae1dc7d9ce4eabe338a875e5ee0b1fba995fae1fa724060c
font_02_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 14920 bytes
SHA-256: 496608f69d11a2d7ae10d8f74403304f5bec3295aa4b36b271042a9b5a4b1ee1