Malicious PDF — malware analysis report

Static analysis result for SHA-256 f075443a5b45a67c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 14:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ddb646956c9366c4273e09f437dde3af SHA-1: ef00a9f3d39ddc6c7d2aae8ede2b4760bcc5e6bb SHA-256: f075443a5b45a67c08028c5ae14a6afb3f61a2cb84762a051f990c99e012f4bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, with a critical ClamAV detection indicating it's a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the URLs are part of a link farm, likely intended to host malicious content or redirect users. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://opt-russtd.ru/data_center/upload_pictures/file/37448711771.pdf In PDF document text
    • http://mylodge-naoshima.com/images/blog/file/53391878026.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/dudakotora.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4429b08---winasewufizopokomadulob.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dusakomovixaxapugoluzu.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/fowaxipefulowufe.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f58de4024---90472257774.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/jatapadu.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210915185420.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/11353979009.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/75733034829.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-14/20210914090853301619.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/fonarenobepenodibo.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/47115981615.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/20121800574.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/60076041107.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/ferakigep.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/8370998241.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/ruvominaguranaxoludikexe.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/34001862563.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/mifenoloz.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/14097315775.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/68852884888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=chapter+three+research+methodologyPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/birodajumim.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_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 10908 bytes
SHA-256: 12fba6979e18899776f2ba6d95933e0217c5a07c5b37ee4018b1b7a74451b158
font_01_sfnt_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 15616 bytes
SHA-256: 335d847335bdc26c341c04c32ae3eb62d263082fd642caa0208396b27c4e0769
font_02_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1