Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eda4ffb1d5a62ce…

MALICIOUS

PDF

93.4 KB Created: 2021-10-12 14:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84837477e325386ed37db5dd4dfae0bc SHA-1: 86606f59817ecdde1055b6cf7a51c7137d9d6d56 SHA-256: 4eda4ffb1d5a62ce448e74e6eacc1548f1da71e22d194d030b9648b7af23e6d3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, with several pointing to suspicious PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://tornyanggrace.com/upload/file/donosoximasumesudovi.pdf In PDF document text
    • https://marathonlaval.com/userfiles/files/naxasufirugofozato.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/68044736799.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20211008025750.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ro2siimak0r6dfeh8239tuslru/34021752033.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/mojutoroligegepijapam.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/zazaxoronir.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/44542210097.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/18741290599.pdfIn PDF document text
    • https://combrooncom.com/contents/files/68094985794.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/xumatawegapemed.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/kalepuxuta.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/84216109686.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/tivixowimajel.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b959bbb170cc2bf1806fa634d57184d6/57543738522.pdfIn PDF document text
    • https://msvadba.ru/files/file/dazugefigubalixedowanakib.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/gazafigilupuki.pdfPDF link annotation
    • https://cuatudongsaigon.vn/uploads/files/38561818346.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/takilugawowozul.pdfIn PDF document text
    • http://njxinbell.com/upload/files/11712262502.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/lijapusebejefowogemira.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/jotesomoxixuzofirol.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/10812544390.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/UsNeCLCzgYg/uplcv?utm_term=dirty+texts+for+your+girlfriendPDF 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_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 10684 bytes
SHA-256: d46011bbc98d15b31cf54251983fb83d0135f77c66239d28b57c9e36caa493cb
font_02_sfnt_off00013434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13434 20184 bytes
SHA-256: 3cd0376058659ee295ea9f21a8a06e768a20b11dc5d8e29c5df8d14c266429fa