Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabf6b410f4b7935…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 12:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0099071c3682b455a3513784e70ccc8c SHA-1: 89a2089dad903cbabb2b9e5fa343455d67f80cac SHA-256: fabf6b410f4b793599096459a504e41cce93ec4c16e594d7b3827329dd7881fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting and appear to be part of a link farm. The presence of JavaScript and numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=random+test+credit+card+number PDF link annotation
    • http://jonme.net/ckupload/files/wunamosotoz.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/mibabupupiboxunuwi.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/bidoda.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/mowakul.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/54312243277.pdfIn PDF document text
    • http://trevorhannant.com/48940115580.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/vodajezivog.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091009364646.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/55871069236.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/vofodovitepuwepemedi.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/julodavoxakakop.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/ziribivarepadad.pdfIn PDF document text
    • http://prmakeup.com/Image/files/36187520277.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/lowaveruzazazonesa.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/fokomonajenonowemebad.pdfIn PDF document text
    • http://kechengchem.com/upload/files/tutobujawof.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fumumovoribinopopezu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b042a2609---46461068195.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/rilekularojedajikewetavab.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/6894966924.pdfIn PDF document text
    • https://telenovella-bg.com/files/76342086746.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/nopufezosokil.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/kozoworataruxekumamatagag.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/1162571019.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_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 17100 bytes
SHA-256: ab5a08d86227d07bb6d790c01351532010aa1035a1dfa51ae5074842c3f55cc5
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10772 bytes
SHA-256: 862df1507971c1c34cd8fa7bfe3476a36d8e85dc3fcb8ec431017263196daec3

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