Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fda24eef3be7fd3…

MALICIOUS

PDF

93.9 KB Created: 2021-09-19 02:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9f0ad5cbaae48910845616b09824fe4 SHA-1: 29d791ae79de92a17a111530d7f5c8ea1bfe6036 SHA-256: 4fda24eef3be7fd387c4dfb66ca024aba81c67574de91b74cbdf9e0c969c3fea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=bloons+td+5+unblocked+games+66 PDF link annotation
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dba4bc9447---9298328026.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79512076101.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/30332385678.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/gededirexatubuvok.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d9a2f9164f0753f019727bffdd989546/sifipulefoxepo.pdfIn PDF document text
    • http://cabini.it/userfiles/files/wivezekafokazomume.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/sululojeburuvinizivix.pdfIn PDF document text
    • http://tid.vn/upload/files/numeniwirugolanot.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/54407035096.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/dakexone.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/8886779546.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/wexedorowidibawew.pdfIn PDF document text
    • https://avenue102.com/uploads/file/81798965242.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/zixap.pdfIn PDF document text
    • http://standdominica.org/files/files/64415610047.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210914093011.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gajimuxamezej.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/86153701544.pdfIn PDF document text
    • http://happy-land.hu/editor_up/pawalavuzubi.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/zusowuwi.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/56575753227.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/08/96521316949.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_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 18456 bytes
SHA-256: bfb5df5153837c9d09420b19e5f9915da7f54e70613ef56b9d8dbaee84cb1ddc
font_02_sfnt_off00014f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F83 11208 bytes
SHA-256: dfdb5c84b841737a3fd96bd1fc2c816af46feab29a13d0eafc16631f28f44980

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