Malicious PDF — malware analysis report

Static analysis result for SHA-256 af56f4a6d4194623…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 15:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb6733ecd21af6e3b4a3b46eeab72355 SHA-1: f5960dbf481e04084735ce7a530c85b23066276c SHA-256: af56f4a6d41946233693cb5a1b0f3c7b640344b96dd87d8ed26db3d2f45256f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown-reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=android+transfer+apps+between+phones PDF link annotation
    • http://benetworkingpro.com/ckfinder/userfiles/files/digatabowozipadusudizi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614222fb40b36---padilavekabafoxumute.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/10057683809.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kinepameguxasokuko.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fufiwagulipoz.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/71970781921.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/14563265338.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/1234726810.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/pubigefejogu.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/jukukulunigabib.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/riveruvomepivexusatob.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/96472177999.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/77810287640.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/302149641.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/56769749683.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/vosezavovuvelora.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/33863806772.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/38467986526.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/75417608378.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/wumokudugamegizesoviki.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/71496715740.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/71760044451.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/45428905383.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf5803d1e---gegebinilolitikupeki.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/67878807473.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/dijipulitefebiwa.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_off0000b4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 15956 bytes
SHA-256: 55d2ca12c087f8d67b91dacb1e39a5cad2f40aa2fe771af48cdff7ce83ea3b23
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 10756 bytes
SHA-256: 601bf051afa1af7e12ba929b22c510ac847cc3398505d65a35a3e7ad18881472