Malicious PDF — malware analysis report

Static analysis result for SHA-256 4232f0b1895a6fd2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 03:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef6676f468a1f483815a5a9cc6e5ec05 SHA-1: 2424f5281caf803e640c6625f62a3a4659705658 SHA-256: 4232f0b1895a6fd2d6af493dc8c57463ac39920a331de470cbe1644ae5b26a10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, with UTM parameters used in redirects, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=call+of+duty+mobile+apk+new+update PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vpjipp2uf41qoft0dh33u2hlq2/13643632626.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/bomovifatunuse.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202192135368177.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/20700544013.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/99885297478.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/47ef06d485e79418ba47e9322332734e/xofuse.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/91506226485.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/35569687314.pdfIn PDF document text
    • http://tabletopad.com/images/file/26815054255.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/88374493553.pdfIn PDF document text
    • http://birdwatching.sk/media/file/18825840218.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/redofisipi.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/62400155477.pdfIn PDF document text
    • http://vhshf.de/File/57114997631.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109152147013876.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/48505642379.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/54142720071.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/guferegitasifum.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/vovelozunugevopale.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/lopewerasuvowowame.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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 10952 bytes
SHA-256: 5e89e58fc1e9c934f6da5fccc39d6411af5075260de6a6fd93b9278dff84ab63
font_02_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 18128 bytes
SHA-256: 94ff606474765bf02478e0cb9977d818e5f6d2646d47e09912c633609dea5a96

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