Malicious PDF — malware analysis report

Static analysis result for SHA-256 695a3f3725cd7d4f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 02:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: aec9a29a13f52d8d2c0371ceca3e8863 SHA-1: d3e639b5a916e7f722a964a6912fdfb6e3f1e95a SHA-256: 695a3f3725cd7d4fc236e6b1ebaa16f85453d45eac79cd37294e43ca45c43516
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs, many of which are on disposable or low-reputation domains, suggesting a phishing or malware distribution campaign. The presence of these links strongly points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=patanjali+yoga+sutras+by+sri+sri+ravi+shankar+pdf PDF link annotation
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/wilurubosujazavebep.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/87966610819.pdfIn PDF document text
    • http://horvathortho.hu/tmp/31034996449.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/69602569680.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/7481060985.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/12589133542.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nimeg.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906085057.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/waduzitogogoxof.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/furelugarinuxebe.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/donimu.pdfIn PDF document text
    • http://wixoon.hu/upload/file/74910175968.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/rimatuwuwegisava.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210904021445_837563432.pdfIn PDF document text
    • http://elsped.hu/files/file/74590478184.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///32364296045.pdfIn PDF document text
    • http://spbi.cz/res/file/zezenaxug.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/47358614235.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/76cf0c32d6bc44961365830dac7463d1/lexofijubusedozepiz.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210915232954.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/71964786474.pdfIn PDF document text
    • http://metallpress.info/files/wibiwejibegigamufixevi.pdfIn PDF document text
    • https://estoniapools.com/contents/files/77448041191.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/61051429685.pdfIn PDF document text
    • 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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 11288 bytes
SHA-256: 4b3d46509eb72bab669b64a3b78e8c766b244085bfe3c3496e0e21e1c467ec70
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 17840 bytes
SHA-256: d2ea98a92069b5b394ba11f4e3b08c218881bbf6cdfb08ae002bcbdb9cd36b8e
font_02_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1