Malicious PDF — malware analysis report

Static analysis result for SHA-256 6757c60fc94bce08…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 579d1b2dd7b52bf70718d71c617342d2 SHA-1: 230cfe130ea7325fd1f014ec2ffe965e6ccf98a4 SHA-256: 6757c60fc94bce082ea5e5903c2d9205f13150b7cf8458c84d78766d46b477dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm with numerous distinct hosts, suggesting an attempt to direct users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://maria-galland.ru/files/file/popoxeguduz.pdf In PDF document text
    • http://yuanhebiotech.com/upload/files/28835749214.pdfIn PDF document text
    • https://eguiders.com/uploads/lokusovesewabefizifurus.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/24393956720.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/52006633554.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/sevibenitedepematun.pdfIn PDF document text
    • http://fteq.ru/files/file/pewiwawutuna.pdfIn PDF document text
    • http://com123.vn/uploads/file/wizaro.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/99936972568.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/50508290224.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rudabuka.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b2bb3377---63601567316.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/72443145226.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/84995157992.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5c47f52ef8f983f851732aadc7be284a/nakukexe.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/66011353686.pdfIn PDF document text
    • http://praguetransfer.com/files/file/27585068758.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/35245543548.pdfIn PDF document text
    • http://nanopena.cz/upload/file/jazad.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322a1b56d46---tireni.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/migusidekut.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/62763010443.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/luxefejosotut.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/pulutumodizufojo.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908061007.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/kesojebuvizew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=moto+g+play+price+in+bangladeshPDF 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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49A 19604 bytes
SHA-256: 8288d16beb4c20c43a37fa04a00de33aeb93feaf4e001706f639768c2b4022d6
font_02_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 11040 bytes
SHA-256: 804477d9071e84300bff7a7f66004e3793ff5b4615ba407a7ff7c40bad9a70ef