Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae4a3c1d7bd721d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 20:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 746cc7a6af5064d103170e396db9e1d2 SHA-1: 58558a05feb8414d441475deb99a7bd2b702d444 SHA-256: 9ae4a3c1d7bd721d9616a898e6d8c5a14419eed5033185bbf48958e4efa14411
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious intent through a large number of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://mikailang.com/userfiles/file/20210909213205_1039814126.pdf In PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/tabuxoxusuvalurug.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/tililuruxi.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/xakepasenupife.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/30388606654.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/65509033358.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/9510346815.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/23782944918.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/82849680182.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/wibimusuzogaxogojoruwel.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/15489423344.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/37336666496.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/28566635109.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11317811302.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/mefixila.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/jopezezovofilosexe.pdfIn PDF document text
    • http://retailcop.ca/files/33167112820.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/426d380d219cbf1de585a2765475ad6a/37666731066.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163071913755209409424.pdfIn PDF document text
    • https://scalping.ir/data/files/file/juwiwosav.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/fuvataze.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387ce01e323---vuzalogafefefitotejuka.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/rinomusixowiz.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zipogaxazukuzogunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=autel+maxi+pc+suitePDF 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_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 19216 bytes
SHA-256: d896418c9a19bc230f3ae13b74b7cb830043bffb5dcedcd85498fa9aa91373d0
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 10396 bytes
SHA-256: e94b840ae2756c53e1176460d212769374236549a3cc39a4a741c06c18e53a72

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