Malicious PDF — malware analysis report

Static analysis result for SHA-256 2169eeff70414817…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 02:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f16101b4723c0c8d0d01a23ce49fa4e0 SHA-1: 95de885993717633d6afc07173b17fdbcd7b9575 SHA-256: 2169eeff7041481736402dc2bbecf0de2cd19630fdd5cba2bc9924fd9a07856a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to PDF files on unknown domains, suggesting a distribution or phishing campaign. The document body was unreadable, but the presence of many links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://turkeyinsurance.info/images/file/renamesasezavege.pdf In PDF document text
    • http://pevak.info/UserFiles/File/xapamararozidakomot.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/sexeken.pdfIn PDF document text
    • http://pnalog.ru/images/file/sasemoxajojudefaban.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210912011930713986gcoo10.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixawedavabibabovodun.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/76808915038.pdfIn PDF document text
    • http://acril.ru/ufiles/files/xejaruve.pdfIn PDF document text
    • http://dejede.com/userfiles/file/92682363845.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/42600320496.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/92271732942.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/18169682397.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/48553756304.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nugufibakiviwinuwilod.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/84217521698.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/77732608729.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd242468bf---jujipasunosepagupone.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/79794768769.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/tepomefinarilafaji.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/jewef.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/27107342903.pdfIn PDF document text
    • http://industra.sk/userfiles/file/91084921988.pdfIn PDF document text
    • http://benetalent.com/upload/files/33773302452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gif+per+whatsapp+androidPDF 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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 10676 bytes
SHA-256: 01f97e78795627bf3916d5ff9bf199636aff7284094b338cc6c608865b850d06
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 18524 bytes
SHA-256: dcd0d12051f46618cc74402af580a26ed3313fea33627f07ea17b06fc08d3f8a
font_02_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1