Malicious PDF — malware analysis report

Static analysis result for SHA-256 f088f13fc8042a91…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 10:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38528a183d24e7e2918cac221b97f42f SHA-1: dd8c0c3b4fad72e128c9734ae847138a8e8c7195 SHA-256: f088f13fc8042a91654ff4a59265d20e48cf166d09d299a30f3e7cabc77407ec
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a download button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=this+a+problem+parsing+the+package PDF link annotation
    • http://dxczx.com/ckfinder/userfiles/files/20210908_000013.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/nufur.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/videdufejex.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/juvekonetorejexa.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/fekefevejoli.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/kodaxizinen.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/65052113411.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109040715524304.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b56d0cafc1---36353769613.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/xozudebi.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/87697644119.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/fesugomokegejafegozemem.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/dilozofasulosevorexagemak.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/63416045863.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/79035424837.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/ziruselud.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/gelarepajofenusotilebuxe.pdfIn PDF document text
    • https://asi-filter.pl/files/file/ropadedibefanelozu.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_off0000d033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 11016 bytes
SHA-256: 9c207c5e1ea27b5fe681822b87f7264199b2732429ab8875ba77f5d6c8c25bdc
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 17308 bytes
SHA-256: bcf2e4efe2557c74eb148bb8b90d87ef3031d3e61fc97641a91ed28b3211904a

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