Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b955ef02dea274e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 02:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df99a3577a607265be394fa40eb799c3 SHA-1: 4c36667ae52e75f954dc0fcde0ce55c80a96257e SHA-256: 0b955ef02dea274e0937e4cd088dd2db1b4307d0004b640a12a9fe190cdfa40c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://onlinendttraining.com/files/72453381058.pdf In PDF document text
    • http://coiffurenais.com/userfiles/file/98595485918.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/89207185543.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/vizonuluzexewo.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/dibeki.pdfIn PDF document text
    • https://mediaskills.rs/files/zataropemu.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/gegoxubipavagodapup.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/besuratojelixibaloduboju.pdfIn PDF document text
    • http://lgassociates.in/uploads/vafoxasujemox.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/fizobu.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/bopimaragemudilum.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/zajunalafuwat.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/81192421660.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/wopobosotug.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/dutubepevafegifem.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194a3319f3---11408055152.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/79773641642.pdfIn PDF document text
    • http://deltools.com/userfiles/file/wafalupomawasudibixi.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/93515303206.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/jusegefolosasujumamadug.pdfIn PDF document text
    • https://ip-pharma.net/data/files/24603494694.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vigesamoregirages.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/40840168378.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/24611167137.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/rinupokamadivemotebutosag.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/tipuvidaduwapejeluvuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=porn+movies+app+downloadPDF 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_off0000b45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 16580 bytes
SHA-256: 5d196bad0042597e1fbe07bd4bf914620c9869e40383a11d71aa2e036475870c
font_02_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 10608 bytes
SHA-256: e7d028528b03f56e1b4cf3017c2d6b1a1cbc8feabcd8b9a8244629b7c22a4ee4