Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bafe1a9b0b95b6f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 01:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d62c6e12aacec7dc0ac6ae40dc38453 SHA-1: 2806080ec5032e003d954df0c875808d0f915214 SHA-256: 0bafe1a9b0b95b6fedbc3ef83a25c660a1deda4b067ca0c8575965af4e6596cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

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://philabc.ru/uplcv?utm_term=general+chemistry+linus+pauling+pdf+download PDF link annotation
    • http://dzirerealtors.com/uploads/vijitegotek.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/rinapepelomew.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/wirig.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/sanogupalinefebed.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/wekejarinoromowukukaka.pdfIn PDF document text
    • https://successalpha.team/upload/files/lamikotufinapokewuz.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/mazenapakirajez.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/fidivowomizebakokaf.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/90323746231.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/92581394249.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/deganebubusopegawog.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/kukebuwikujabe.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/2648840794.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161418fb95501a---49510045257.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/bororebenuwukiradeza.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/52885296991.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/finagaxedabubemudab.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/41440831104.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/xarefizano.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/83978570204.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/228bf393a6e558d6a70f21d0e5edf1dc/posedajinaxenewolowadavar.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/10273742251.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/gabemapiferaditavedos.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/90735563138.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_off0000c4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FC 17664 bytes
SHA-256: 66ab4e77ffc8080532e2030543681cb9a0fda7a8ff1cae540017261d465cd48b
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 11408 bytes
SHA-256: 1387f1221a6a5f12204fc19c6c2dd98cfff08e522df71bcbf8956970a010c1ed
font_02_sfnt_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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