Malicious PDF — malware analysis report

Static analysis result for SHA-256 112f99254add5977…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 03:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 592e3c8be972b8adcde2cb8fdfe1ee42 SHA-1: 41f6fab10b48831171d6915521030c136ccb76da SHA-256: 112f99254add59771afb89005a164ea2ff896bf74d02e3f1c773d9deb7e4121b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=ed+sheeran+thinking+out+loud+mp3+download PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b97c2cda3---93866965244.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/11222669129.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26598349386.pdfIn PDF document text
    • http://air-ned.com/uploads/files/81619171181.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fijosumivanivur.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3pom1nfqm3lfc8r6osvucvs907/ditame.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/49793234423.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/buzalaja.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/pidigizawudilujifo.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/kixegaponiwodoxul.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/kivibili.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/wapetob.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/41938082554.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/bowisifanogejasukovarax.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/xovijiwumewokuboweti.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/98541392966.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/20096783420.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/28193618984.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/binixisezovim.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/92235585573.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/gulubogusenodolijebu.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/10062498366.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/61867457659.pdfIn PDF document text
    • http://santehnika34.ru/images/file/guvawopuxoxuz.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_off0000c151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC151 19576 bytes
SHA-256: 51907cb049d27b6b4a2dbce9c2a2c64d1df301e81639e596bbfeccc80e52e72f
font_01_sfnt_off0000f443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 11272 bytes
SHA-256: 1a1264f80fa45d0b1710fe1bef439db21a895c734b9597d54e1a463b3ca3a6d7
font_02_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1