Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1729f71c98707cb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 01:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 316ee405804990bf8e1cd3fd57492fcb SHA-1: e146893a8e8b6a7e27b2b6a9dd0a8c6ec0126d22 SHA-256: a1729f71c98707cbba916c425057300122eda54e9c2d0d4a8c7f072c2201f78f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, with a high-confidence heuristic flagging a link to algorithmically-generated URL on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=connect+xbox+360+controller+to+android+bluetooth PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fcd95d0b3---jibajuto.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630949336880057138.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/mevon.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/38649800266.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133fceda3cb3---17804510220.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/98110809110.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/4020813749.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/masezolixerujukezugot.pdfIn PDF document text
    • http://halmar.info/userfiles/file/82371447774.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/4186009485.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/xusosod.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902014612_1479505682.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vuvorogopobulekumuduj.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/zuxerekizumikelo.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tiviwiwuxatokub.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/42725068022.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zotunalorupomokigamatima.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/rirotixoraperotux.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/wubuvogajufugemor.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/21861446818.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/96288591368.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/duwixixux.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/kamibabinoxowoxotu.pdfIn PDF document text
    • http://www.puhito.hu/uploads/16909919995.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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 11136 bytes
SHA-256: 3c47c84c7b5cc5cb31e46ef75dfe7da3178f3463b65faaaffe0966ac11244698
font_02_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 18008 bytes
SHA-256: 6242984feb9a0c7e67ae1156e332b4d0e1f73b45d3d17add3ab5e8868fc506d4