Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc616015fd2cb06a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 02:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db05be9b4498c8a0a63445f356fcaa57 SHA-1: e8b33898ff50a9b91f2eb39e5ae5cd364683b329 SHA-256: dc616015fd2cb06a71f38e22ebdd7f6129ef6acc03288aa672360fbfc8f9239d
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs, with one suspicious URL pointing to a PDF file on a potentially disposable host. The presence of numerous links suggests an attempt to direct users to malicious websites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nj-rshb.com/v15/Upload/file/20219141224207639.pdf In PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/bawiniwawufupene.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/nuxafajikibizasa.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/xutozuduzasipamoki.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/90417455840.pdfIn PDF document text
    • http://topflexsports.com/uploads/46717860183.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kixigupifepikof.pdfIn PDF document text
    • http://szcftz.com/upload/2428042947.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/87480259817.pdfIn PDF document text
    • http://caythuocnam.org/images/files/15748403363.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/dovapepudipabozepogixutu.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/matagis.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/2327520405.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-11/20210911044843823375.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631240253541226565.pdfIn PDF document text
    • http://terrietanaka.com/library/files/56761500453.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/nodugodal.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/gowinilolukobiw.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/siliwa.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/rozezoxesebodanefuw.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/julinep.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/jitidawe.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gokizopa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f2c112efb---99686126707.pdfIn PDF document text
    • http://furniture83.com/upload/files/mozolupagesubesejinazazes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=my+hero+academia+ova+dubPDF 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_off0000c0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D2 17920 bytes
SHA-256: 56bd41ccdc7f65ce75f2f1c30549cfe389967ed6ff19496d932c65e64ea40d25
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 10632 bytes
SHA-256: e5348994bc324550089bcb6f6e5d6e986b1fd1f25c8812672f6852df9daa8af9

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