Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ddf54f1602d9af…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 21:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a89417c99e74d38968683c468e4ff7b6 SHA-1: 3940a8615c87662794eb9303f118def5d287e9e9 SHA-256: 21ddf54f1602d9af017c15c4a7686aad69be59f098ef3eefd0d7ca7827417e20
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of multiple suspicious URLs and the overall structure point towards a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=garena+free+fire+apk+obb PDF link annotation
    • http://www.kingsmen-cmti.com/upload/files/79893500219.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dcmocgfnotlk6v8fujinrk2lj3/55492278737.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/79692613452.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zogodidubixo.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/62830489093.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/74752774592.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pelamazabuwowemufa.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/28119953268.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/47931178417.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108312210128599.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/38566430087.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/72976050677.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/081809308800.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/jutexowefot.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/51852489411.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/rikivarutenabenukafixipom.pdfIn PDF document text
    • http://ternovykh.ru/content/file/domotarikegos.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/4088013158.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/wavekasikaxukijax.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/17815278615.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/53281379886.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/bipodajikosevitoguvo.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/gimase.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/99256808017.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/46878543276.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/kejabavobuwogad.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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10308 bytes
SHA-256: 267b7e9c636c87d251d33bb0e6bfb6c319440eac239fea2a60703ef4a93e369a
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 17848 bytes
SHA-256: b17e98636d1e6523ce04dfb07d6c94a7d1e1e5d06f727d5e6fc92cefa643c8af
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1