Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ab34f14a8a812f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 11:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a20adf97a8dea965d258e461581e2a7b SHA-1: 8b395e2b8092098b56768ad969e8abbe783bb59b SHA-256: 50ab34f14a8a812fd888e8ba28fa6b042b0c4436ef87134a99e899dceb3421c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are structured as a link farm. This suggests an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mayphoviet.com/media/ftp/file/jaguzelokuletatavepakaru.pdf In PDF document text
    • http://alphamarino.kz/images/news/file/48062002143.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/mosujunajave.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/25227468344.pdfIn PDF document text
    • http://trieuduong.com/images/Download/vuzazidafekepe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/terenizubanabipoperijifis.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/44127728387.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/11843013077.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/4607372757.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/208ec96827d45db0f496284e2037bf87/33969434176.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/96208179236.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/50809873784.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/4581790095.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/13566037623.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/75635152051.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/xevomorilebutavizev.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11422244529.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/45844604829.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/xobeka.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/5499003537.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/97520327250.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/15569011853.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/paxikojafewiwaxavulepo.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/92844032521.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zidujuxuloragafitafogiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=geometry+dash+2.3+apk+downloadPDF link annotation
    • 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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 17248 bytes
SHA-256: 7c573f907275784e4203517d787fef97a1cc956e5d5987e72b04b8f8e103e3df
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 11252 bytes
SHA-256: a40fc784d6492f85be5401881eaff94771f8cf20a1032208aa1bee8857697dcf