Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0f57c03800131e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 03:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 294bd37078a708dea16e29065f2c811b SHA-1: 4717ca1245aa6a18039d1a2062446ca3857d9e27 SHA-256: 0b0f57c03800131ed8b43c154dd094c157c1b8a18ce97a9ffda56ecb830f07ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating a likely attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://hosungtour.net/FileData/ckfinder/files/20210910_23FC5405798D3F95.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/66733803556.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/98146089141.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/2046777293.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/zobiwunurajutakub.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/769019169.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/tagerejizijixufav.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e735342f1c8a4f523bf43ef643c84638/26823758949.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/jabedi.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/bivufixaxu.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/fifijonuxuzajinebevitiva.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/gemoxaj.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/sivupawadinemomad.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/6931334444.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/xuziso.pdfIn PDF document text
    • https://clubon.top/uploads/files/29406805756.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/19871449094.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/73966117809.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/23025772789.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffd0827ff---wiled.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/givefofub.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/rudemarone.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/xakipovizagap.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/bejuzenene.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/40055070133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=roblox+mod+robux+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_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 17280 bytes
SHA-256: a985ca0612663b39dfaef921bce918ae02ad1af424657fcbf9bc911659765958
font_01_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10400 bytes
SHA-256: b0e2a5d6450bf844c8e179726b09462fc67050d3af4dd776ca0ab3751b7e8d4c
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1