Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c65e136e7dc914…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 21:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 46f334b3cee4f549d6a20212742f9731 SHA-1: c6b7492b955875fdab85a19b26814070a4137ff1 SHA-256: 27c65e136e7dc914527d0f107d081043e2e0f0e46b13df040183cf231ea50961
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://crysiq.ru/uplcv?utm_term=shooting+games+play+for+free PDF link annotation
    • http://quetthe.com/upload/files/72692675990.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/gesomelovuperogiju.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/34773235655.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/pexudugirafa.pdfIn PDF document text
    • https://tigapilar.com/upload/files/bijoludurijodez.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/vesizujisatujagope.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/42288071476.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/92336142270.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/petaravezilolokizawewibeg.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/85836600073.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/35618034257.pdfIn PDF document text
    • https://bunianco.com/other_files/File/65932785021.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/22924854952.pdfIn PDF document text
    • http://mqskin.com/luutru/files/zoduregegubamisan.pdfIn PDF document text
    • http://sharedsynergy.com/userfiles/file/70229372976.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/jejixitilapuferenakiget.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/kufafegapukawapeluw.pdfIn PDF document text
    • http://alptw.com/images/files/juxut.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/xejutodin.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/pabazaxopegenugigidire.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613e786d3db9f---bezoruvuvigediguv.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/ramafirujumodoximovorod.pdfIn PDF document text
    • http://glassick.com/userfiles/file/17396504522.pdfIn PDF document text
    • https://advik.net/userfiles/file/95932620004.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210914051356.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_off0000b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 16996 bytes
SHA-256: fd2d52c3087709b01fdd7bed7618cf1df2296cdf1a75fd92900e9803733ecfb9
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10996 bytes
SHA-256: b88c4480b338bbcfdb801e5f112957a84c5ad1c2be249d602318b0849325a30d

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