Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f43a67d09a4d9f2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 08:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 341d8bb85d1e271a51f9a97f1af55355 SHA-1: 3b7d5814d0d333c96643831d452c30b1208bfa2d SHA-256: 9f43a67d09a4d9f2c04705180a686a6664e97de4eb0199bfd750c247f34c7912
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many links on disposable hosting, suggesting an attempt to obscure the true malicious destination or evade detection. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509ba7a356---20207330128.pdf In PDF document text
    • http://kirakuramen.com/uploads/files/63164541883.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/weduto.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/wokawa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/47497533950.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/vebatabereziwolap.pdfIn PDF document text
    • http://come2menorca.com/images/file/femufogojatuven.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/32741356016.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/jonetagabefitu.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/42520631229.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/73155494823.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/44910228183.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/najarazejupugururigu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a446b85a332aa5771108cdfe0cd91198/viwabuvujalufosozak.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pebefun.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mawufifenusojilizozimemu.pdfIn PDF document text
    • http://newworldss.com/uploads/file/wugikaxapakeripa.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109170634008567.pdfIn PDF document text
    • http://soyana.de/js/ckfinder/userfiles/files/13364610297.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/rewesomawurunopinawob.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mokamozomep.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///52583572549.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/14618158337.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97091995568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+store+7.0+apkPDF link annotation
    • 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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 10496 bytes
SHA-256: 0ff8c5ead79f37111e543bcf96f7db6144b615e74fb93d817487077a2a730c51
font_01_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 17816 bytes
SHA-256: 8a9655db50ea29136174fe6e7eba995331e42cfdcd0fd7b1fe25b745fb0be210
font_02_sfnt_off00012b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1