Malicious PDF — malware analysis report

Static analysis result for SHA-256 745cf25f8787b1c0…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 12:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 70e00ba7eff56caaedcc9983061967e3 SHA-1: ac3ff3c0a0f8c09c20cfcc11f91380353e50089f SHA-256: 745cf25f8787b1c010cd35895f98a398037fcf161d42d055df9f7ee11d01a94c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and a small file size. Heuristics indicate it's a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to phishing pages.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://dongphat.net/upload/files/92623164462.pdf In PDF document text
    • http://zulaikhatextile.com/userfiles/files/68412542749.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/rabagowiwizomiweg.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/tetixibebukawinasitafo.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/xonifobomuwuzi.pdfIn PDF document text
    • http://espwireless.net/uploads/file/bamojabedapuratudexi.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/fonewefovisegidababeda.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/logapufugapukerul.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wezujalosebujodojebu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/61233003167.pdfIn PDF document text
    • https://norservis.cz/files/files/wapepiso.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/de91bfa8d557c624f4550d84fcd183a0/76955242798.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/86524242657.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/45917047065.pdfIn PDF document text
    • http://chikatere.com/Upload/files/3138376490.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/lutaxopazifo.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/44622758628.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109090836129229.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/49419734441.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/77218780623.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/60028526614.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/23/80625473198.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/pezitunudojafapag.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc5b4a9ce---gumedurokivu.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/20187233173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=top+tv+download+sitesPDF 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_off0000b35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 14140 bytes
SHA-256: c4edfddd59924aec0130c47b918b9ccb33b5edf70469635d487776ae9f84833a
font_01_sfnt_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10400 bytes
SHA-256: f554e41a12ae2b2d614d46dba634ba0a9c82750b7257787379e06f67592771f8