Malicious PDF — malware analysis report

Static analysis result for SHA-256 112e56134d9bd79e…

MALICIOUS

PDF

82.2 KB Created: 2021-10-08 23:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 29829f73110b8876e4fc9b60e1966468 SHA-1: 37250f88105918c73729b86a98685447abf5a22f SHA-256: 112e56134d9bd79e935e89b31ecb285233576bb3649d7a77a2fc537e15a7d841
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly indicate the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=new+horizons+graceful+painting PDF link annotation
    • http://biznesfishki.ru/files/userfiles/files/vakoxubiferiluvig.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/fijali.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/bawenalodozobak.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/85731469230.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03cb1f63ddd3ea73272410b77ac8bc1e/jovudid.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/82825696299.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/dofezofukovar.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/zoradujorowikijasexiwot.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/kenajiwodepubadasafojarim.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202110041444251597.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/mowufeki.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///dopimatemop.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sobebugati.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/v89j37gcjhi3amsc3tf4aljj07/vogajedosakafadoritipi.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/poxobawegafigi.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/lotigiragurobo.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/48174779263.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/rixobututimijanezifuwaxa.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/gifevujirebowagovak.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nuzatega.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/46541849928.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/20229335641.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/30299447631.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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10984 bytes
SHA-256: e6d9cf2a650c9eaa732d173201f1e3b7f05586b6ca94c07e53cd84472c97d569
font_02_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 19184 bytes
SHA-256: e65190824deb6e93779bc6a1f46f80cd878fe4c2d8850a0068f3a6c1eca250e4