Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa58c0434264883e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 16:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b6be5536f8486f273230a8dcec58ada SHA-1: 11ca9f3eb76940c87cee5920bd4b2bf844f48b9f SHA-256: fa58c0434264883e9828274b2a8b31e05d678c2bdc4dc63c0e54f035be1aae42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged the file as malicious. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=turbo+vpn+lite+apk+for+pc PDF link annotation
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/94367088416.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/95101185618.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/domigugaworefevoru.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/43733492712.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/nofomo.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/57050762052.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/48229221460.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210907_0BF997514323E8A5.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/bisanupusiwomivim.pdfIn PDF document text
    • https://eklyps.net/images/file/botade.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/rabofad.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/relufudejotimev.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/13645173555.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/nuduxobuka.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/11355809568.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/damofuwetit.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/lulitevobanaru.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/30013229554.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4b2be5b2---gezejogovo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906110643389020.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/jijutebuz.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/tatubofekiguvere.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/64582326821.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-11/images/files/99039898634.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/3015997491.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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 19540 bytes
SHA-256: 494aaa680973ea669295713d6ef437bb656fb10e1187694d53677e6c16f0d1d8
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 10668 bytes
SHA-256: 8295ffd979ed48708e494e72f1aa9f718e88012c388f437979bcb7980bf86adb

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