Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b329f5f558807d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 23:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10339eb7120595ec11b256f4688a9699 SHA-1: e5b4a8ba42be1b9b03441667531261faa0ddefee SHA-256: 40b329f5f558807d16c213c63801d5496db703aea13aa4626458e3a01194484e
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly suggest a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=chords+all+of+me+jazz PDF link annotation
    • http://dietetyka-24.pl/images/files/43307344699.pdfIn PDF document text
    • http://bdn10.cz/files/file/64762423265.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907061835.pdfIn PDF document text
    • http://abworder.com/uploads/files/90452970971.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/woraragekowotiwurur.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/23387986912.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/17501727611.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/29951789148.pdfIn PDF document text
    • https://buyafranchise.org/files/files/28935981323.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_032308.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/kedigimesuje.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/bexotiborowupe.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/80227372126.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/mixuwa.pdfIn PDF document text
    • https://soechi.com/userfiles/file/39932965356.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/4506195636.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91540835859.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/resela.pdfIn PDF document text
    • http://congluc.com/upload/files/10676691868.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/sedikanuw.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tegaxepobuzasiw.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_off0000c4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 10544 bytes
SHA-256: 7732ab2d3761632a3e5d8f190dc279faf9cd84ea6d58c697b9545278ba30451d
font_02_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 17352 bytes
SHA-256: f994ea04daf5b81dce141f8f379c360b8c63a981c02673af0d5e66fac97c5e68

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