Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d903c8a2f389f9a…

MALICIOUS

PDF

76.1 KB Created: 2021-10-03 00:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ccdb46446cdd66b2d846f909ea4be1e SHA-1: f368e970a8892e62ab914001205998d43071e454 SHA-256: 0d903c8a2f389f9ac08a8b3f3b4e36bc91ee65b01b7209a97a609e80f62ad4b3
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various PDF files on distinct, potentially disposable domains, characteristic of a link farm. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

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://hieuchuan.com/upload/files/xubukinebotudowotin.pdf In PDF document text
    • http://3mfa.com/images/editor/files/wazifowakukefezar.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/bowovabumovofaporar.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/25240228448.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210922193217.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/votize.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/gebuguxumanazi.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/lipof.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/82201483093.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/vopotijijuzazob.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/vebajodotoderidulubudokiw.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/23820879626.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/83823340510.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/48239354086.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/58891432167.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/4m3ea70r05durf6gbgo81jaqec/20953743416.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/70807022994.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/53814410398.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/12891677866.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/pifejosenen.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/lefabapugubofa.pdfIn PDF document text
    • http://zl369.net/userfiles/file/majodivenit.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/91546432652.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/56036459307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+lighthouse+watch+online+123PDF 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_off0000bfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 10900 bytes
SHA-256: 39352f1b0516b806a02ac97bf64b965b5f41c6d309c2b49321b839b88e95eb3f
font_02_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 18700 bytes
SHA-256: 5e4c61aad3c56a67083abe907b3d964df560e39dabe2eecb7551f6925d5f2005