Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89a49badc1074f2…

MALICIOUS

PDF

87.3 KB Created: 2021-09-23 15:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 306ec9bffba61350d0626e1e43e755f3 SHA-1: a48983475b09ddea3ba6a24b5366d6df894b0e31 SHA-256: a89a49badc1074f2e7179405449232d8f94fd38b185153941cbb2283832c4598
146 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains numerous embedded URIs, many of which point to external domains and an IP address, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://fabriziocar.it/userfiles/files/73387245136.pdf In PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/titadugonakavafuvusidokaj.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/fenewuseje.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/58495241621.pdfPDF link annotation
    • http://frangarcia.eu/upload/file/94041456057.pdfIn PDF document text
    • http://fitviewer.biz/files/file/86084637589.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/kivezefezagusozizulav.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/topisunotadenim.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/nasilojolasit.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/xozemejimufugin.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bisexalojizakejotebisital.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/45771827104.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382823d9fc3---57871039750.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210914054634.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/97439805581.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/wufupizelugulebawawifuwow.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/37750605264.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/51923196020.pdfIn PDF document text
    • http://ccadl.com/files/20210909142145.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/55416311498.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/28418872893.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/18073273718.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210904180347.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/kinopur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wifi+blocker+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_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 17236 bytes
SHA-256: 7bf2900f81895e86d8b360cddaf1ee99a00b6c9701ead05bd0443fbae775145d
font_01_sfnt_off00011fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 10428 bytes
SHA-256: cb09cd35bb06db768360ea786beccfd2368fca5bba588c86e6a7d73baf25b6b6
font_02_sfnt_off00013756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1