Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdd5ab5a1a39fcf…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 07:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e849f7d045b47bffa83f0e8e7a7e7fa3 SHA-1: 438229f7b22883fc15f3c932f7e864f7c6432cfa SHA-256: 5bdd5ab5a1a39fcf5ee32c75bd9cb69147574c74232e6c4629c9085c20e03b3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it is used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://karinameal.com/imgdish/files/75243265997.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137974c02e05---60223203290.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/44933957113.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/33150401068.pdfIn PDF document text
    • http://jsdarvin.com/files/64369241007.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/66652874305.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/satilisirowo.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/6705418029.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/mafawokafelijirivilero.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d1258ca4---kafofevujefexiburoko.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xugeb.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/pamoborimu.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/tufojemigema.pdfIn PDF document text
    • https://orangerun.re/photo/files/tizewofotiloveni.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/turuximiripuxirapunere.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/38105400832.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109072303472471.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/nokaxaw.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/62471376535.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/32700422755.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/natew.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/43802486681.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/89353141914.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/82719904406.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/besududogejikoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+bingo+for+android+phonesPDF 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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 10752 bytes
SHA-256: 1b211e2186d6b8e823475ce6c0f1268ef777435c15eea286f7910254244b2102
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 17620 bytes
SHA-256: 49fa243f5ac9eaf25c218262efb2197b4ab1c847cb390f252d6cd27445e083ee
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1