Malicious PDF — malware analysis report

Static analysis result for SHA-256 819de292eb89a8dd…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 19:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c17ca3c4bbef677949070b1d210f4ea2 SHA-1: f5626ae428d6e9d6c131ab5bd9792de2067cf545 SHA-256: 819de292eb89a8ddd63a7dbf3bd1c5338d8a6bb0f9319d620b3c628bf7e5d294
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a link farm designed for SEO manipulation or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=redmi+go+message+ringtone+download PDF link annotation
    • http://rafaelstore.ru/upload/files/kaxusura.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5fb4c9c2---xijusezalexadumu.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/texexewuxome.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/17670670718.pdfIn PDF document text
    • http://aven.su/userfiles/file/38367223594.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/tanikurukekojegiwusebo.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/2018165591.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109170212202684.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/28072240245.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/fital.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/62515244750.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/rojafad.pdfIn PDF document text
    • http://specialcats.nl/media/files/jiperikubudukavopido.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/pekefepavojagatote.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/ruvizonuzibulezef.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210907084858_cmVwZXdpenVrZQ==.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/61978024705.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/90504022476.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/85839657757.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/kodikajilemifujevus.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/gunalapodukisele.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/lesuvebob.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/65820366055.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_off0000bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB5 16824 bytes
SHA-256: 4c8f27d193e014a4288bd9dd468bd5347f498a97813588c474232ea84103d766
font_01_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 10724 bytes
SHA-256: ed2416908200709a2879acf8cbeff7e06c11e3b1802bf32b35a80282c65e8016

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