Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a8142c5cc9b079…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 02:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e5b916f3680c0734756e00df91374ec SHA-1: 6c62161c2627617a190a242b7cf67367d135ad1d SHA-256: 78a8142c5cc9b0794578cc72c77c49e0298bb104da63f7ff8751671c794b48aa
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on untrusted hosting, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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 https://smidgel.ru/uplcv?utm_term=sultan+movie+salman+khan+online+watch PDF link annotation
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kikemewekinotunabodibux.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/vanoxitadasubesuno.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/60277820719.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/jelebunamodevagi.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/bagasabigebudolis.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/94869628321.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/22887875555.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/831838620.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/54236417261.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/47115188400.pdfIn PDF document text
    • http://gardatrans.com/content/Files/84983325339.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/bamojufunanit.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/62ffd7c30b5b651a2056a3b5e58494cc/noxixepobumud.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/53554585501.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45771934110.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/5863528321.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/sujekezodipevuwavav.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34919525066.pdfIn PDF document text
    • http://nature-revive.org/files/file/ladunalepexadezuzuwajemi.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/23455376642.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-2/20210902213419904985.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/94826905156.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/85203906322.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/turowibejules.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/jopujuzubufudibowerid.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/jematakanifipi.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_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 18400 bytes
SHA-256: 4e3512d43e305e5f1cb3746f4679b99339e89efc1c4d3527b86defd19c3b523c
font_01_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 10816 bytes
SHA-256: b075b1a693cdf0b7a9e3c7e3c20a994c247e4b0a8fa1716b3e695df775d2563c

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