Malicious PDF — malware analysis report

Static analysis result for SHA-256 749ff3860af9c0ee…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 02:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3f5c2bd05a8b267b525a274ec73fe04 SHA-1: 352bcc85172c8ab1ede75870629147f45ebfa324 SHA-256: 749ff3860af9c0ee76a2f5e098e35ee36ef7367cf0de19991b1655f72e3f69fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is part of a link farm designed to manipulate search engine results or host malicious files. While no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to other PDFs supports this link farm hypothesis. The document's structure and the nature of the URLs suggest it is likely used as a lure or for SEO poisoning.

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 https://aeternoplanning.com/ckfinder/userfiles/files/5243066423.pdf In PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/susuduwujujomukata.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/tilegefilewa.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/tidivexexanosiwajigu.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xuzaneramut.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/bobujadatopedodegoxonubew.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/kebadakuwedepip.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/38385872678.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/62281494967.pdfIn PDF document text
    • https://binhvi.com/upload/files/ziwitivatepi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134f0bf807a8---27914717097.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/18745549573.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/karikipik.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/63144609352.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/piduzuvafowibarugubolelut.pdfIn PDF document text
    • http://forti.in/userfiles/file/92365544051.pdfIn PDF document text
    • https://t2sc.me/userfiles/jedezani.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/6073134171.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/574sdl2b51vqhrc90bfjnu34k8/wuvofememekivakodofiju.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/laroxege.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/ronapewe.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/84293896586.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jariwusixatotisas.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/fusosepotesus.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/10686029278.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bonog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=super+monsters+ate+my+condo+androidPDF 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_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 10916 bytes
SHA-256: 8424ad480b853e32f1d56c592d66ea830e1665747d2c063ebb2ca96bf789be33
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 17724 bytes
SHA-256: e6bce2e6609e5395e210d8110c36a5c008f41cdae4c3c9e842936b70eef9c133
font_02_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1