Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc05f7fa65e3526…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 07:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c73c170a314544c71532674a521ae34 SHA-1: 455349f851ccd160bfced3c9bb55474ca2f3004b SHA-256: 6fc05f7fa65e3526ddb2b7084947ac9eb185496795cf7b53b9974e4ecbc22ca8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, suggesting a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute content through a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=terraria+obb+file+download PDF link annotation
    • https://812423.situshoki1.com/contents/files/9902633370.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/kopinotajiwe.pdfIn PDF document text
    • http://planbmedia.hu/files/17238327671.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/podejozafigazes.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/65831198122.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/84162805266.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kinuwimakukukonajukin.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/pekufujomigutikasu.pdfIn PDF document text
    • http://anninh247.info/upload/files/xofakosupabowa.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/foduruloxomefufivala.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pasazakubegebepakitakufak.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ruwiluvewar.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/57222019173.pdfIn PDF document text
    • http://markone-tools.com/upload/files/vomafi.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/94058198916.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vesinigotenejamezorid.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cb1d5fa9---xusagazun.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/43588270037.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/3307825762.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gibusukob.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/nujaxikujojutogunox.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210916230308.pdfIn PDF document text
    • http://ned.ru/uploads/files/21130065192.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d84dd9f22ea969e516dbad13f883e322/27352171103.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/feturerexurizipelitewumo.pdfIn PDF document text
    • 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_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 18440 bytes
SHA-256: 92668fc776839d43dda063b0834fb085e0d083aba6e9bb53fa2a0ef83309fdc7
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 10272 bytes
SHA-256: 8a3cf2a5edbff52f3bdee659ddc0b1b296bcfb1c91b0ac91f57a4a2b679b47fd
font_02_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1