Malicious PDF — malware analysis report

Static analysis result for SHA-256 b662c9fffa062542…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 23:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f9bf8078955b1c1749829df549d9b7bf SHA-1: 19268f13ad0d09d07994ff37a3cb328e1bea77a7 SHA-256: b662c9fffa062542e91e4e51667e72bb234a26559aaec5cf001e0c3beb03fe60
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a malicious intent to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4887

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://odessawa.com/userfiles/file/tunatuluwuwajifawamifad.pdf In PDF document text
    • http://l-max.ru/userfiles/file/zekagomu.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/voxerefurevedutugofi.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/mowufugadiwesupelok.pdfIn PDF document text
    • http://hmed.vn/upload/files/lemorufedij.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/81895027605.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45639382619.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/18920549090.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/pofepes.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/lowesiruvujiwe.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/80200772712.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/23562788928.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/32830017047.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2bb10c7af2ff5c80b11d111b9152c898/68578302473.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210916224632.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/31123091483.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wirafobete.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614053bac2f8e---lawopuvofuwobowuzenarewij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+hotspot+does+not+work+on+my+laptopPDF link annotation
    • 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_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 10852 bytes
SHA-256: 106e6c5643ab0a469495179c9fdee5472992ec90c6e4f89b2654db81ad369906
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 17204 bytes
SHA-256: 5679c9f6011d1b4ad403f2dd05949fd604431fcd75eede476d031f6f0fb496d2
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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