Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d0e9ad19086a36…

MALICIOUS

PDF

89.2 KB Created: 2021-09-23 17:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 918acc20dc1a884e035c511b334e4bc1 SHA-1: 1a7d2b1a57e35ec251debb5914a5a3874d82970f SHA-256: 26d0e9ad19086a36753ba1212e98222ca204521bb328c00ee7287e88f37c20a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this 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://cructi.ru/uplcv?utm_term=grand+piece+online+codes PDF link annotation
    • http://receptlap.hu/files/26529912779.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/fetofiwogelekogebeludir.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/jomovasonoduj.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/gimiz.pdfIn PDF document text
    • https://shunnasato.com/kinikejajevo.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/81778208319.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/53784636781.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/fukokumi.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/pedamov.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/zubujuguribowaledixaposup.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/mebujowotaxodivogazizekin.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/53239007567.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ca6567758---roximatolegurejewedikunor.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/99124380652.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/ximixomogita.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/73933556230.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/bubuwajafupulefemit.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/42233347741.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/vawoxadoduvefitelu.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/65195700261.pdfIn PDF document text
    • https://okazionche.com/files/92673875542.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9ac8a84dd2dc93c045f7d2da7b28ce57/57697643433.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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 10448 bytes
SHA-256: 3563f6be5e70770ff1624b33d30c16590c08a3778720d9387b51d2f95bbb33c3
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 18664 bytes
SHA-256: d7a37c4bca376d62095372a7a0b232873f5c429090a0b38812cff35953d2503c

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