Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0967a74e03fe54…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 13:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b943755e7050b68e7364098681c41d1a SHA-1: 6643342c52075d01e0b1356d7bfa7ac33a62fe82 SHA-256: 7b0967a74e03fe546feec6ad2f6548289e45563e735b70befe3392dfc6e46cfd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of multiple disposable hosts and UTM parameters in URLs further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://honmamon-s.com/img_seminar/userfiles/file/18399515609.pdf In PDF document text
    • http://detikakdeti.ru/img/file/jazumusajitisuwemet.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/varisalam.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/79984226419.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/94691814281.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/totuxuxon.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe0c4b9029---70688179357.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/9028454418.pdfIn PDF document text
    • https://datawire.gr/files/files/482880641.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73615916625.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ms64jripakdust6f8lltfhevp2/46191713068.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/basomowamumokil.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/3526059514.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/80660536363.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/74716597291.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/52670871300.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/3329147683.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/88430897056.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/topotafojapetar.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/mefafiviwujuvelunurajugi.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/kegowoj.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/58912291286.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/kepazikipobagugijej.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/vafujenasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=zakhmi+full+movie+online+dev+kharoudPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/28571669424.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d5d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD5D1 18708 bytes
SHA-256: b3710520094ba0684246359fc3bf55cb4a698f28226656110ab7ac22b2aa3e96
font_00_sfnt_off0000bdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF2 10572 bytes
SHA-256: 52812c395910ba675f1634a54fd1578254478a97cb8f1f9a633d94a9616df0b2
font_02_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 18432 bytes
SHA-256: 219983de6af062bb887a1ddca477614e1487a60400686e78e1cf8ca3e23eb823
font_03_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1