Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ec4e73a8e0dcd9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 19:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e9525e25a9861c6a0177b6fb029b979 SHA-1: fe09cb312badea828791761040d3ac2253e3143b SHA-256: e6ec4e73a8e0dcd972322d20f53efef2a291c1aec0a82c1cf51eaba723620310
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external, potentially malicious sites, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest a phishing or malware distribution intent. The ClamAV detection further confirms its malicious nature, likely exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://crewmak.ru/uplcv?utm_term=kenneth+h+rosen+discrete+mathematics+and+its+applications+7th+edition+solutions PDF link annotation
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/kamobelaniredufaw.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomokiwomadume.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/72108733596.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/javurudavatadop.pdfIn PDF document text
    • https://12shio1.com/contents/files/buxokomo.pdfIn PDF document text
    • http://195exim.com/datas/files/28478199994.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/wikanug.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/94808197751.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/76387037007.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/27673747180.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614463f317bc7---66036858354.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/87472549986.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/70981603870.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/18848918871.pdfIn PDF document text
    • http://tano-cable.com/d/files/79901717787.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/xalibemulido.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/vekaxozusemodiromopadapak.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/xonimiwekadejiwumojunise.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614165f4b7a0c---1383761579.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rufusipiwitalofaxox.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/zokatoj.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/58981248366.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/raxezosozosukona.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/67527639983.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/50336603857.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/53512096280.pdfIn PDF document text
    • https://remini.hu/userfiles/file/falujazomime.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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 10920 bytes
SHA-256: 0c8e7532c55889be5887c76d069f8236473fecb95b2a98418a00d4314f71503c
font_01_sfnt_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 15964 bytes
SHA-256: ff009d48af23c87576291507d71df8ed75e7832f42d961ae2c9f72dfed49c518