Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1841ac404b0f117…

MALICIOUS

PDF

74.0 KB Created: 2021-10-03 05:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2350f0993f770abc126319fda07548c SHA-1: 9a3316ad64f71fca4f64848deeaac7b6fe803db3 SHA-256: f1841ac404b0f117004d1093dae186309759b9d9c77a8a99feea1038d2fc9e76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obfuscate the final destination. The presence of external URIs and the overall structure suggest a phishing attempt to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://nitexprofi.cz/userfiles/file/xenisimisafurilik.pdf In PDF document text
    • http://gamecoast.by/uploads/files/99008625210.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jusol.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff16a84aca---41939816880.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/66810633124.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3962786f328edd6a29645e6a20d79e9/gezixumovu.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/pufapedopugagifatifak.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/92291627333.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/81294935984.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/jasekosigoberojis.pdfIn PDF document text
    • http://africareview.in/userfiles/file/xupovemabuzeped.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/11826062194.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109101809095184.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/dilewanifibe.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jenaduvusak.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/wipatito.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/rozetoraradek.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/12487015958.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/bebunuwuzub.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/gegudubekeporekuvodaj.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/zezopabibegetut.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/pulujikimitajenedelawufi.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/lixose.pdfIn PDF document text
    • https://mcgbaharat.com/userfiles/file/remamezofojonigodiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=12+angry+men+1997+123moviesPDF 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_off0000b4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 19512 bytes
SHA-256: 266c7147959086c11ac5a1ad0c5fa6bfe4c4727ffb30d8932d61e66d10b489b2
font_01_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10952 bytes
SHA-256: 24945694802230c6aff0dd9b15f7b332bda185444b71c4b9b0d9c1b7aad4b024

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