Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95388f2e4c7145f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 13:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b18b834c0dd74b39ce95df53093c7309 SHA-1: e36cff79305daa47fc4693e47700c55191c285e0 SHA-256: d95388f2e4c7145f663457b7504937b4c1a0651b2bcfa125fff08c7dbed44e09
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to potentially malicious content, including one that uses a raw IP address. The PDF structure and embedded URIs suggest it is part of a link farm designed to redirect users to phishing or malware download sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=gumrah+movie+download+1080p PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cea5c29bd---zumomegipi.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210913003628.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/80809039702.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7917c2cfb---29729110709.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/mowewasilidozolokomo.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/84460235255.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/57615527792.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/8051590596.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/pupudap.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/87132658636.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/rafab.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/39354006364.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/powexor.pdfPDF link annotation
    • http://angelofthewinds.org/ckfinder/userfiles/files/lowojolawixiliwenu.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/sodibiniwixadozul.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/ropomamasinesipipoforizi.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202192213241.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/47559127661.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/71783782448.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/64775829217.pdfIn PDF document text
    • http://getdol.com/page_data/file/64289999632.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/97195689202.pdfIn PDF document text
    • http://bamila.vn/luutru/files/fasukanemejuzamosofedisi.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/fijetusanomezexo.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/gusana.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/wamozozegulunodap.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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 17524 bytes
SHA-256: 5088b5b0705281f0c5da496fa4517384c2a5eeeb01669b9797bd3db0b3d730b7
font_01_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 11064 bytes
SHA-256: 45cb107635c1b5861d318d5209f4cdc91248f34a4d40fb7d804c4ef4c40db5a2
font_02_sfnt_off0001316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1