Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f37e86d96239f6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 22:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10e4446cdafe1daf99778899880da20a SHA-1: 71e1ea5a9dcd53fcf4632255823efec6568cdc91 SHA-256: f7f37e86d96239f6ede9e89878959a992b4aec44e639a1ba2f1dc62702bf3643
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also references multiple external URLs, including one identified as a link farm, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dribblebar.pl/userfiles/file/xoniju.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/59a28a0b645613b35be8f6b1b7ba9761/7288342603.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/xuwakukotosatedewivili.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/niminugex.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/telim.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/92374889181.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/94721421120.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/lewonuvuw.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/78204229821.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/65276550513.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/50772786943.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/96914578711.pdfIn PDF document text
    • http://kurishupally.org/userfiles/file/lexugobivabevo.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/bolesuxetugeboletoze.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/98807424060.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9h65ll341tv3s32njl29p1ul27/22276263396.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/20839106555.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/rowakidef.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kilaputowiruzivonuzil.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/18148392047.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81184083280.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/72813481844.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/63975741180.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/83290119243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cell+phone+slowPDF 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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 18148 bytes
SHA-256: 899d43bc742e103babeafd7e1b1aabf3fa6ffec41b1ef063dd0b08670646dc74
font_01_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 10012 bytes
SHA-256: c769a5fcfafa032756164a05e5c73eb5af5b6b8ffaf48298be6d109d48b72e33