Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c17718a964fc1b1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 16:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 4dcf05fb794448cd4461b5a1621dd0fc SHA-1: 8eb9f498c5318909a9fb90b866466b5b63600100 SHA-256: 8c17718a964fc1b1d3050eb4f7aa235e3ae04a849a1fc29f5bd46c89067c5fb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://havilahbuilders.com/userfiles/file/tekaxogofabotufo.pdf In PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/degatuzuronezaxarules.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jemitenaruzizitu.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/28463876952.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/lixijabovanokikosesefo.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/16445687831.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zunifef.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090603091341.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108312349318588.pdfIn PDF document text
    • http://104408017.linker.tw/files/sisusadumatofexub.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3664292354.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/32258374138.pdfIn PDF document text
    • http://gensugroup.com/upload/files/datepago.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/vodubasof.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/gesufisikesotizelub.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/68612074868.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/86271689237.pdfIn PDF document text
    • http://fluorescent-training.com/file/kusexasowivananozexun.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/lapezupik.pdfIn PDF document text
    • http://lejonhund.com/upload/geletiworozufufakategur.pdfIn PDF document text
    • http://vuason.vn/upload/files/vimobefoxena.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/sitonewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=live+stream+boxing+fight+tonightPDF 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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10880 bytes
SHA-256: f166a6b3910720dcb06f2d26c7cdd46cbf43ce5282d6e759cda960c5b14b07f4
font_02_sfnt_off00010eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB7 17456 bytes
SHA-256: 63fef724b934c333307541fb32b60882121808ea2056fd64b1112dfa60f8b61c

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