Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c4d34e7094bcc…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 09:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b415ea8b6987b10efe71831fa42e1af SHA-1: 53aa4a5055bb2445ca87dc9c13791793040dce25 SHA-256: d28c4d34e7094bcc27bfbf2510f1da652298bc83c3970321b7725f75b93d5195
174 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection. It presents a visual download button and password instructions, suggesting a lure to download a password-protected archive, likely containing a malicious payload. The embedded URLs point to various PDF files, indicating a link farm or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://oasis-inwaste.asia/files/file/89281591412.pdf In PDF document text
    • https://sabunwangi.com/contents/files/24767918884.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/rumaxijelafapamu.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/wigifubise.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/gobines.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lomevewinoximafenixeta.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/diwosoravopi.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/vulubetuwikitaseforuralu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1fd1d5295e91a6402a7548cc7d30be0c/divifemuxonulagefeg.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d27788d238---noxijoxodilajoga.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/fuwazi.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/xuwulil.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210905072621.pdfIn PDF document text
    • http://kaies.cn/upfiles/210907070224508343i799gg.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/39743586730.pdfIn PDF document text
    • http://strahyi.ru/images/file/jokitugotoji.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/wonaxori.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/58299946334.pdfIn PDF document text
    • http://watch62.ru/files/files/zekuze.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/83367129264.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/dujokidilasumorolumiju.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/luraj.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/82095043077.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/luwaxutaredutuwefimofuwi.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/49628081252.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/xuxil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=spider+man+3+ppsspp+gameplayPDF 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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 17312 bytes
SHA-256: c1a106f8d7f3eb49bb02d823250533f75c84bbc07fb2a7726256004842717a52
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 10880 bytes
SHA-256: 19faaca2137b82d020e4d28ed66de5295e162c46a1dcec2ab129a63600a42865
font_02_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1