Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c6d7c2506a21a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 05:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6ad3a71e5b4779e24a74ceb5bd2fc96 SHA-1: d65f073576e028cf7d5b20f669eb08768080440b SHA-256: f81c6d7c2506a21af8d92c20c62969dbc4f5521633a7b5e17c87cb359cb3c324
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a setup designed to host many files on disposable domains.

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 http://dakmet.pl/upload/7823430420.pdf In PDF document text
    • http://aybar-gallery.com/userfiles/files/58948716673.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/bizuroxalifogudamo.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/tevevixizur.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/47161016627.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/40900407852.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/2921324125.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/mexane.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b57c653da7---jesasedikokoxuse.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/kalisowof.pdfIn PDF document text
    • http://guowangcable.com/d/files/genijeko.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/36877091441.pdfIn PDF document text
    • http://falerisztika.hu/tmp/81927116927.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/55071625961.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/gamevonelokosomukuxi.pdfIn PDF document text
    • http://kelvista.lt/images/files/88638072531.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613FCCDB7044A.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/40038375861.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/52973011787.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/rabagujazezebudozuwe.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/dejimisaforidodawarov.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/58532931890.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/21876345417.pdfIn PDF document text
    • https://777mto.net/contents/files/41649928620.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/70981639625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=adobe+mod+apk+downloadPDF 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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 10396 bytes
SHA-256: 68e81e94543920e7de1c631dded6d0a3d5558a32c24600a98774922929bc5d05
font_01_sfnt_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 16500 bytes
SHA-256: 7907adc93743012cc443f0b7f2780c2fdd2b15f7003a0192a613524c36be8801

Open this report in the interactive analyzer, or submit your own file for analysis.