Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4604ac8fd27ce6d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 15:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 220264b2f8a48120b24659fad6dfdd6e SHA-1: 265c6738047f07d2d427ecf40c3917979562d23d SHA-256: c4604ac8fd27ce6dffdd356e262f1670391205e47691340e77359af78dd2e080
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection attempt. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of multiple unknown URLs suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://puzynowska-kancelaria.com/userfiles/file/24859716639.pdf In PDF document text
    • http://newdimension.su/userfiles/file/91470732188.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/jadezipidelozorelixud.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/konuba.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/jugavafokegonutis.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/75541580921.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/61965144096.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/gakulemegobelosewarazosos.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/fopiwuvi.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/pagolopefik.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/6751412752.pdfIn PDF document text
    • http://hotstamping.pl/files/file/wokowibisid.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/sunanuxisuzer.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/51605523288.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbecf0ace---bozaxoza.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/fiwevixis.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fc96b7f043b63225b9d5ac43f599dfe0/20055839259.pdfIn PDF document text
    • https://yellowstonewildlife.com/rezalosuzexodinesib.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/67217187842.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/vezinadewurozofebaj.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/91650544602.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905022558.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/l0pb4bc4nblhrnfa0g4f8b3quh/razavatonufodekukiwovofu.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/zodonawidit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=essentials+of+cardiopulmonary+physical+therapy+4th+edition+pdfPDF 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_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 11160 bytes
SHA-256: 61e5d7e09782318d7d24b744c93edb457a298818e3a1b6990c88a5d705670e35
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 17216 bytes
SHA-256: cd63afd5fe4d51598f34b85995020ce710237ae883c97e0cb0a9d2d6f9b2ea81
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1