Malicious PDF — malware analysis report

Static analysis result for SHA-256 09682e0738389087…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 20:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a85925ba2ea25f1a56c6d66cf43e8acb SHA-1: fa24e30b84b1e9be9e20063bea4c448b4981ee35 SHA-256: 09682e0738389087a11b616f0d5c6b25637c3de40e2936ed40c2356bbb46ca2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://drafthe.ru/uplcv?utm_term=como+bajar+ringtones+gratis+para+android PDF link annotation
    • http://paoladebenedetti.eu/userfiles/files/70484125192.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/37464637403.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/59442748324.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/liwesixokarazoje.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/58637612405.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/sumitig.pdfIn PDF document text
    • http://sparkpro.lv/content/file/71357908924.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/nunedogoxotevamo.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/weneseki.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/52443052205.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370fc02ce6b---63858201856.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/66500942970.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/32961805881.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/ritifunawadozenewanunazu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd02b687d---9754430277.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/76880224441.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/62345922180.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/73574652409.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xobopawanipubariwenatuzu.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1119336304.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/jimubeneri.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/memere.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/69760091602.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/lazezivixatemivoxida.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vimuwokiz.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210914_139923376DCAEF85.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_off0000de6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10988 bytes
SHA-256: 2aca2ad3b57698a369af1bee3513f46d595810c435018f264d916a0727c92d83
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 19388 bytes
SHA-256: 0325a8c9cdb20b0025da35e5fe1cc26985166b86e425194ffeb75b7270c3603f