Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea07cf0cac8cc2f1…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 17:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6250d6af4675c3002c243ea405eb2f0f SHA-1: 0e06310f7e63b07d997436d33a65cc3a658e93c1 SHA-256: ea07cf0cac8cc2f1ee4bfccf84d461dccbda29ecad11485c65e92c76b2211e88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution intent. No scripts were extracted, but the sheer volume of suspicious URLs points to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8075

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://archism.ru/uplcv?utm_term=justice+league+tamil+dubbed+movie+watch+online PDF link annotation
    • https://tideandtigers.com/ckfinder/userfiles/files/65875984102.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/defodesuxunifikuve.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/11340499805.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/mewakakuwo.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/dibegawelinibinog.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/nuvofemig.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/palinevinusaxudage.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/2829981667.pdfIn PDF document text
    • https://longhungphat.org/Images_upload/files/58781996670.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/38122604776.pdfIn PDF document text
    • https://coluer.ir/documents/file/vefidumuduvubububife.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/zoxemapaziduzod.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614226bc22c15---libatiwususoxuloruminamot.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/56578966199.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/45845884234.pdfIn PDF document text
    • http://delve-cr.com/uploads/90800561951.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/56596806624.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109200409278501.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/wozapimen.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/wajogapororipepulu.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/17133992347.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/86853304935.pdfIn 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_off0000afac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 11100 bytes
SHA-256: 02b522dd3af1e115108ed5e455a8e6c8588bf914c63b6d7a551d8869bc084772
font_01_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 15796 bytes
SHA-256: 14a7ff6f8eeb173623bd79b909a6d6e7cb1932dbdfbf4ba34660e29fcf79cf04

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