Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fd41eb114996c0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 00:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 836584d0df9192e91dc5f7eefbccbc38 SHA-1: e54615b2d94059ca9438f5af288e11a3049d4c9f SHA-256: 35fd41eb114996c0ee5040eba857106aaf14abd4631d1b95f0983af45d5f1b68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are indicative of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rovitek.com/userfiles/file/wevinatutovogujekatatevaw.pdf In PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/jusanibakunoti.pdfIn PDF document text
    • http://soc-in.com/data/media/files/bevidoxaxi.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/36639474724.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139068e70078---vasufiliditine.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/75490381727.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210911141111.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/46574275532.pdfIn PDF document text
    • http://oris-am.com/editor_up/41048170525.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/37487443077.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/36305991038.pdfIn PDF document text
    • http://identik.hu/editor_up/87910463664.pdfIn PDF document text
    • https://aaaxxion.info/images/file/72661116162.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/vagadojatog.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/63057186503.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143c122f0e52---vukudakaxowazowabuno.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/45862496618.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sewesumovobifogefat.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/zedulotukabaga.pdfIn PDF document text
    • http://cwesp.biz/upload/file/jerotaweropupijo.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/gavekiwuriravaxipofamodi.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/16501924854.pdfIn PDF document text
    • http://esipro.be/userfiles/file/86656770168.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109071503446734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=led+notification+p40+litePDF 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_off0000bd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 10504 bytes
SHA-256: f2d12737a5e2c1722bd2e12387c1b26cace34578d32e55a5391eda91850693ac
font_02_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 19240 bytes
SHA-256: 5ed5769135f355feb40e5a028087363c2686b6da1dcf6fb8227d501770d083de

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