Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb136a080df7fa4…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 18:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f6cc64f91b97c025f8f55543f869d562 SHA-1: 3f9224e224f82dcd4ee663629aca93720172ea35 SHA-256: acb136a080df7fa4ed1c9c07dc1a802cc8ba6f22a401a062e2e726d8bf33315f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs pointing to various domains, many of which are structured to appear as file downloads, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs further indicates tracking for marketing or malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=queen+of+the+night+aria+highest+note PDF link annotation
    • https://zweefvlieg.net/userfiles/file/67241539892.pdfIn PDF document text
    • https://rinducm1.com/contents/files/poguzaniwiva.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/dilafinixagezosigim.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/25038555833.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/fifaz.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/68996850826.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/65565543770.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/zafawugezumo.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/58808152536.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/zikejojemekobopafadi.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/13016133238.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/15899173831.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/68959851817.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/fajugusevobejupasakujev.pdfIn PDF document text
    • https://dacola.com/upload/files/1969429651.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/8466168363.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/kowum.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161565cc4ca198---29310633782.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/3068522054.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/banabev.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/31470270851.pdfIn PDF document text
    • http://hodori247.com/uploads/files/kawuxijofikurokijaranude.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/19718363956.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/zudorikojoriveludikolob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 10604 bytes
SHA-256: 767f57efa5200e1b5b0d8a9b83321eda85379583a1426c0faa5024c1c6caeae2
font_02_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 14824 bytes
SHA-256: 3a82f90b3dcce5f4722f1127982ca056989cfb22fa92c26435f6892d34bd57dc