Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc24fae615ddbde4…

MALICIOUS

PDF

96.1 KB Created: 2021-09-18 12:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ecd44f8c87d90c3fa97ff8dda38c5ec1 SHA-1: d9a8d437d9b8adc4f31b75e4c7bbe45e3e834a81 SHA-256: cc24fae615ddbde494c29644178a904802f23cf7402422e99020fe158d805012
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which are on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://crysiq.ru/uplcv?utm_term=turbo+vpn+mod+apk+free+download PDF link annotation
    • http://zussobrance.sk/grafika/dokumenty/notesab.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16317485645.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/tagixoxigokobim.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/68229358640.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/50084552005.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/88046222415.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/tuberitivapavos.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/pezawodojepe.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/34433349704.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/65054997570.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/71838285321.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/losaw.pdfIn PDF document text
    • http://119pump.net/d/files/69509009763.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/83443624308.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/sudakoronub.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/lodonaju.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/rafezaxabuxup.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/73556957049.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/16668071215.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/zametego.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/27862480458.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a142143c---sibadididawo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/90259834725.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b20a40fcdf537ba62155bc71a537d53e/25660491905.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/bolekujipewesituzizefes.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10748 bytes
SHA-256: ba0e509338d1dfebb8b9d32f52e7db1f22f7afcf724f5605fc871c297556e469
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 2128 bytes
SHA-256: 612cd5c70f487f82f128e08f6c1a101e52ba34f65993c4dc5bc4253f0511cf1b
font_02_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 16652 bytes
SHA-256: 831f591436e121f159b9e3e137bca4fa7654619bc79a913b0c2753223debb956
font_03_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 26728 bytes
SHA-256: 028cbfcafc84bb841530d9c0b45049362a7a0546678676da6291675cde8cf2c5