Malicious PDF — malware analysis report

Static analysis result for SHA-256 663744db6a1dd0ff…

MALICIOUS

PDF

61.4 KB Created: 2021-09-16 02:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0b2d0a9a89da772d084867f4842efd4 SHA-1: afc4873873dda2724e2278e9bb8414b479368c31 SHA-256: 663744db6a1dd0ff72fe8745ba540e6dcd44daf9db9d905f208d581811dd61ac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically calls out the use of disposable hosting and redirector URLs, suggesting an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 4

  • 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
  • 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://moje-stranky.eu/userfiles/file/30500982504.pdf In PDF document text
    • http://photopuzzle.net/userData/board/file/zosif.pdfIn PDF document text
    • http://theponghop.com/upload/files/gipajoketilaxokavirilemos.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wijubevojeko.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/27122522858.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/susogogegowagiwimamusemaw.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/fipefeziwitenudejewep.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/padafupigavulatusujefu.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210910075051.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0901/ea3b462ef6feafb6011aa5387a0079df.pdfIn PDF document text
    • https://landi-bg.com/images/file/zerujelelozoxedese.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/376463623612ff42bea3b3.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091104193473499.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/32792624872.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/51344732440.pdfIn PDF document text
    • https://clickbox.ro/images/file/zifovabumipodoratilifuroj.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/83749556943.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210904_093B71CF2B12F910.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_2E868D0E9E468C6B.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/jujigu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134c827060d9---53283481192.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109167916_319846395.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/r6jlh2tilch7q1koqofe9no3up/12327148772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+9+prime+camera+specsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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