Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf1d5460b8d7458…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 18:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a77ccf000a8c60a2399f80291ce9055 SHA-1: 57903a3e0736f0766968c0530b7468b6fe13aff9 SHA-256: 3cf1d5460b8d745829a1fe92f3b8400c719b253faea6427d5b249562786da3a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a T1566.001 (Spearphishing Attachment) attack pattern, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=real+car+parking+3d+apk PDF link annotation
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/61271891915.pdfIn PDF document text
    • http://bptramptour.pl/files/file/70861254254.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/8828608644.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/nedejekobesirase.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/sirezaxuvik.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u0ivrilr9qenuo0juhtn05rcs2/nalume.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfdb20406---gokotoguzexuvujuwu.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96671201441.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/fofuwa.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/kebumegelaribijodofow.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/wawakuwu.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/bebapimo.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/dewofuvoziwosotusigu.pdfIn PDF document text
    • http://szm.hu/userfiles/file/20106320077.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wakotusobebepamefosawisi.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/41646580230.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/24562067179.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/rawogowoxonojekotusugajo.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/70842382498.pdfIn PDF document text
    • https://icbacademy.com/upload/files/mokibukanef.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/42099902354.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/20583589533.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/41713241319.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/31632956270.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mozanizorobad.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_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 10612 bytes
SHA-256: f267ea1eb138fd3cdfbb254933f946604f7380fad287825b59c4543522d2c9e7
font_01_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17396 bytes
SHA-256: 28de621daefb41ff2d07e882f93beea154917312bb9905e5263ffa4d1b7a012e
font_02_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1