Malicious PDF — malware analysis report

Static analysis result for SHA-256 934a6b8f3543f53d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-10 09:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b4fffb09c58d2ec637b50081862aca8 SHA-1: 4dde2e2291b13be8c0f067c4c2b100ca5b23ed99 SHA-256: 934a6b8f3543f53d1cd787fec9355ead913017580057878991fe753f0c6f2d33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://primeasset.hu/fileok/file/36544064002.pdf In PDF document text
    • https://huangs.tw/uploads/files/202109081534343103.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/87554839710.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/pakufemosasituxigabenaro.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/wuduvevubamawu.pdfIn PDF document text
    • https://wittnebel.dk/file/fufaxuvixil.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901111732157797.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/10967621847.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161374e3678b32---begoxowefovowulonazo.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_5746E67BB043C4A8.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/76993416935.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/54786060133.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/16592817528.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/81271836218.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/70892186347.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/wegasiwumosuvotavutapumo.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/40194175200.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/4650558081.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/58569378063.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/77828645247.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/85193850656.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/10560561461395f264c6a5.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/38079952623.pdfIn PDF document text
    • https://membermimpi.com/contents/files/rudomaruwabunar.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pfoqc9kojk125buh37gpc4u6k0/suxegodafof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hogwarts+a+history+by+bathilda+bagshot+pdfPDF 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_off0000bd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 10872 bytes
SHA-256: 91024b2cb7161a4cafe5ae1cf81a60bce352b5e784962733376818c0b1c69238
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16552 bytes
SHA-256: 0e6c30010eba94fcba38b0730f19ab9b95ab77983396d9a3d988ed248d5a57a4