Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0c94b549c080d6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 01:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea6a05bc4f9f4b061fd0b9070bf92695 SHA-1: 4a14b08817d834ea62740b41e36a27805fa133d5 SHA-256: 3b0c94b549c080d649b6a01f9b6a73fc9b00338ca4ce522aff7bb32fd2ce44ae
174 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, some of which are part of a link farm, and includes an instruction to disable security software, indicating a malicious intent to bypass defenses. While no scripts were directly extracted, the presence of embedded URLs and the security bypass instruction suggest the document is designed to lure the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://newshieldinsurance.com/demo/gsa/final/images/file/bazogoxetupakaduduziluli.pdf In PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/4969023798.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/masuluw.pdfIn PDF document text
    • http://wamer.org/userfiles/file/kebozi.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/46623355242.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/42520760372.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/40751803047.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/mekukivasifusosija.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sibawamodoka.pdfIn PDF document text
    • https://basisnomor.com/contents/files/femovisazulogegoxesinazes.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/33866823085.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/tekudofitijapa.pdfIn PDF document text
    • http://eternoohydro.com/d/files/mesedoxen.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20495309050.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902085159.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/39886577675.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c5a8cf04---53099231075.pdfIn PDF document text
    • https://digireg.cz/upload/numekobiribararetatawizo.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904045027.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/35317243849.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/63732409857.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gexenegelezanesi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8aa2d786e8721c86435e740808abd8d6/zafabudo.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/22364517238.pdfIn PDF document text
    • http://onelove.cz/file/19689696542.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/16688755025.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/84588870616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=steven+universe+unleash+the+light+download+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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 18896 bytes
SHA-256: 30c657b8a8e87756b5fe732a08f366f47633c0519c6e3a0970d33b83b70983e6
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 11092 bytes
SHA-256: 5aaee5208999aee6c92c5a8356af3a508696cf14b37e0037e4523febda2beaf9

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