Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dc41b2f52f38fc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 16:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a700371227966eb81ff29238576efe73 SHA-1: b227e1afba9ba3df809b064a2d7be7c7f54604ae SHA-256: 68dc41b2f52f38fc91033efff48d9ab0420c6f6e28b384a1d8c49a28190d7850
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is intended to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://miryangpension.com/FileData/ckfinder/files/20210911_B3C285BE5121EABE.pdf In PDF document text
    • http://dailycan.com/userfiles/files/gabowavixubizogejot.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/80725134229.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631642515.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/04/file/20210904_163223_177.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nenajajefev.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f499cac38d---dinurevimarow.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/60222600259.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/50171426501.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/vajoxira.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109022033251952.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/guzawipusujexegif.pdfIn PDF document text
    • http://starma.pl/files/file/rigero.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/81768791006.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/99488596111.pdfIn PDF document text
    • http://ccsl.asia/files/39594537919.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/medemelinini.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/5231327066.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/71413452321.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/50275752757.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/94053235747.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/9802586727.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/39870168683.pdfIn PDF document text
    • http://synergyproperty.com/images/files/marejazuxuzuvunuxoguwof.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021932328374667.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/87047371767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+note+taking+app+for+samsung+galaxy+tab+s6PDF 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_off0000c346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC346 16944 bytes
SHA-256: d1a4cda32f6d9c4133a8e17108c09fa2e869489b5df1d51a6b6659a71d9819b2
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 11472 bytes
SHA-256: 3e2e70edc421ce556068bec31f562a2821d44a54016508af5ba232adde845422
font_02_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1