Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fed37f9d594afb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-23 05:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c397987fbcb9a56384498701fad56da0 SHA-1: 5c669806d6fab0cc05bdf30d5bcb6f9bed908ffd SHA-256: 49fed37f9d594afb875c31c1e3ffd4d3923bc9923f1284af33ba5a15185f3201
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The presence of numerous external URIs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=how+to+fix+headphone+jack+on+android PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3ql9cp0qmkla6f1h8p979qnc20/nejenufimeserogifekimetor.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8485911721.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/24905169193.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/16190526057.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/wofusajarediluzalafesirip.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/vemezafu.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/siginovat.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/saxobovamorawiwinujeni.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/rotuvekexudijidiliwaxig.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zabavinepinujemexufi.pdfIn PDF document text
    • https://izometal.net/mm/file/4492050255.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/lelibabubodijitun.pdfIn PDF document text
    • https://badoza.net/userfiles/file/85920740820.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/mitakupamotegimoz.pdfIn PDF document text
    • http://it-hair.com/userfiles/45294019247.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/86123353157.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161406a513a62d---80649352235.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/sagafulidexewasapan.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/xopurometezekoxekenuwobu.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/lejabatekitidikow.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sokifa.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/92649226965.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/vaboguxawe.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/24935157627.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_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 18112 bytes
SHA-256: 972af964a48bf6629049bc347ac6defb5197610efc14ae5b2e264f46a7490111
font_02_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10904 bytes
SHA-256: 819627408a168db4a59291b3e134d7005003cff951300d7b5c0daa07dd3bf076

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