Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c66917ff13d6b82…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 08:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6dc1b9b912fa3a35969962cac153f41 SHA-1: c377bacf84b2a398bbfa2e4043269ed2a9474495 SHA-256: 7c66917ff13d6b82f8c570304d00529151d5ffee0fa3b363eef446570488e8a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, indicating a phishing or redirection attempt. The presence of many distinct hosts and the use of UTM parameters suggest an effort to obscure the final destination and track clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://detikakdeti.ru/img/file/51485861093.pdf In PDF document text
    • https://solelane.com/ckfinder/userfiles/files/nebiwatupenapufirefe.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/90821097870.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021919846576113.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/73766213285.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/lurojujan.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/50461118067.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/pixodipajajasofepomejit.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/95603251072.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/66013226267.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/94785948333.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/retugidinexugele.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zefolilaguwaduwiwumawibim.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/36150891520.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/kutarililupixadewixun.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/30490890973.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/24944646851.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/vapetixa.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/7372931224.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bixuzileluwuniduwik.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/tosite.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/gufipope.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88043997254.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/mamokevujo.pdfIn PDF document text
    • http://jainfarms.com/uploads/kuxegirotev.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/42695403458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cornerstone+in+the+biblePDF 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_off0000bb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 10212 bytes
SHA-256: a7ecc269b5909acc166aff8a45d0e56e56491ec468bcfb687d894479b768c0f8
font_02_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 15996 bytes
SHA-256: d4f795ecc5db1b01a5b2dd1530d042d265d9b0694583037c1e307625f6223b6b