Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b374a5276c7f39…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 00:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4519fbd194c937058aa42a666473343 SHA-1: 141a7cfcd161d229a4ecba1745e54ec0a7bd9104 SHA-256: f8b374a5276c7f39724fda212a4ff4652b740e44cb0d2a661aab078f5114a52b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic to trick users into interacting with a malicious link. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages, suggesting a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=watch+wonder+woman+1984+watch+online PDF link annotation
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210920090305.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/sexemanexewaxogogexixof.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/remaniwokomujexabodorave.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/85368717786.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/ramipokiluranonasaxo.pdfIn PDF document text
    • http://in24g.com/upload/file/68216509599.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/95077769529.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/47049328961.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/71813001082.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/67782547020.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/muxex.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161451d417979d---mofeperizofopebopep.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/rozewivomubuwozavetuzig.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/19527855945.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/46890c2ec5f37dc805da503417869b0c.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/fedesufadiwelafus.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/27272598942.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/82555779643.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd52165870---97186241164.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/noperufetuvebovuwabof.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xoraduditiliwakugutu.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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 14520 bytes
SHA-256: bf1e09a59ad19405a9b63f4dbf6c3d9e77b4f19f8654b8994292b302a488ffc6
font_01_sfnt_off0000d321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 11052 bytes
SHA-256: 62a093f53594e23c7e68f488a929f5a28457bb90b33d21c1c1f0e629ca7d08cf
font_02_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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