Malicious PDF — malware analysis report

Static analysis result for SHA-256 833fedf9d2e64aff…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 00:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f25474f568a2253268058ef957d0d58 SHA-1: 062d4269611f8381b85f828c26cd77266255ea8c SHA-256: 833fedf9d2e64affae652b49b8db30a3d42af78287b275829d365205a718ce14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are link farms pointing to other PDF files, suggesting a distribution or phishing campaign. The presence of 'utm_term=among us download app' in one URL indicates a potential lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rydelko.eu/userfiles/file/dopadorekekisenukisoguv.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462c88c5d5f---29896033926.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/fufufemujetaxuf.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ak8ajacmjeplr0egcp8sdv803n/98009612570.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/fuvokesepev.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/30571230220.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/86418900898.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/7836259166.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/kokiganamalafoputasaguwe.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907125512.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/45615373964.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/wirobiloz.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210911_220452.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/65824781370.pdfIn PDF document text
    • https://msvadba.ru/files/file/dazugefigubalixedowanakib.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/kagumelimaketas.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/nufororuzamosoxuvilu.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/93293733372.pdfIn PDF document text
    • https://krusomying.com/data/file/88293549593.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/pigowiwupobut.pdfIn PDF document text
    • http://iccarrentals.com/files/file/79854312801.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/37844027785.pdfIn PDF document text
    • http://princeverma.in/uploads/files/kigiwarelegabu.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/xojabukexibepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=among+us+download+appPDF 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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10480 bytes
SHA-256: 66c242ea6b90b59cb58969c206578b02c201e1f04023f6c2cd6ddb26506e86d0
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 18052 bytes
SHA-256: 13f7c2430ffd0e1d8ed0d2942cb134b280e8368c1b3a7834a42c7d95cebd5774

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