Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bb26fbc82b961a…

MALICIOUS

PDF

87.2 KB Created: 2021-10-14 15:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 125a793653e685eb948506836b8c6e03 SHA-1: 694431ac3f644f159cea67927a679f92ab6af98c SHA-256: d6bb26fbc82b961a91a584995d01c77cac0dca88b526edfcf400b6b1d85b7151
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. Heuristics also flag it as a potential link farm and a malicious PDF based on ML classification and ClamAV detection. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://alamansyria.com/userfiles/file/kijudeledoruso.pdf In PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/14939621566.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/88325216172.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/78638829029.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/gulojoxozu.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/32391578247.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/81891667647.pdfIn PDF document text
    • https://teamcode.net/upload/files/67697282521.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16152b7eb85838---panijosetof.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/58745060079.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/kividuxuri.pdfIn PDF document text
    • https://kultmotor.hu/images/files/3431812179.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021100922530973499.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/70669224699.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xixub.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/24660992733.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109092332231367.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/47617506554.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/jikekotaja.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615355ad7f847---13256119990.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210923175738.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/bokisa.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210912_105355.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/87330826898.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/19878724079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=need+for+speed+underground+download+for+windows+10PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/donusazokelopen.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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 18636 bytes
SHA-256: c2736d5baf61b8c98933007c28b3ad35d0846e59fc657bc4280525f2c3cb1179
font_01_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 10912 bytes
SHA-256: 7c1dbda87a6a5d64e7973d1ae033cd84bde327a7130092ba3417f59e2c2cbaa3
font_02_sfnt_off00013661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1