Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bb75d1c163a2e3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 06:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de8afcc74fc7df46f6df63f38cc88878 SHA-1: 1e5019b58ac60a2bbec428cb511cefd324f61e80 SHA-256: 76bb75d1c163a2e34d18afdf1f82b95210698f738feb88431822d6af08141677
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous external URIs were extracted, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=streaming+film+harry+potter+and+the+order+of+the+phoenix PDF link annotation
    • http://polins.org/public/userfiles/file/welebe.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ea091e6630c9d461d447c46bb5154772/59940715880.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/rudowotebalapene.pdfIn PDF document text
    • http://hrudolf.com/userfiles/gudiloropa.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210909/files/20210909082152.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/28380652436.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/tedipiwas.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81510532123.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/gadenonirabelivuxinika.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/15592422134.pdfIn PDF document text
    • https://eslms.com/userfiles/file/pifapomesigavuvigiwo.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210909133257901365cwm20c.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161332485abdff---39401345853.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/86583237640.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/6985865711.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lifijata.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/68524818400.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/10079469907.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/nezisabupefinotefetotob.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/nisakafazilixumivujusuf.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wexenegidopufusovo.pdfIn PDF document text
    • http://usagimatur.com/files/others/22222214319.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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 18776 bytes
SHA-256: ec9eb13c2a0fa2f67357b116b8c95687b6bce2ee41353efba954c8259a2e610b
font_02_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 11068 bytes
SHA-256: 18c19cf6ef8b040a36e3c439db50bf64d91d216576eafc95e8bf4a5798e0bbd6

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