Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd921dc2f58ead3…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 20:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58d633ac15396a019f22c71d4f1c9583 SHA-1: 24013ca31a4a8db5f830212c458787068e6c826e SHA-256: cbd921dc2f58ead30f008211294ecc8379295223dc9d474e9845a91b727ebabc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links pointing to external content, likely to obscure the true malicious destination or to distribute various payloads. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=coach+bus+simulator+2017+mod+apk PDF link annotation
    • http://quranday.org/userfiles/file/soxatidolofutegaketipukok.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xanivodusamusogopef.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/78400864209.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vorixarejobetujuvavokog.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210912012252.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///goregileme.pdfIn PDF document text
    • http://cudicio.it/images/file/17335963284.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/22034688338.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/nisavemefameme.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/40380470592.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/sovalenidiji.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/13992468602.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/85158874237.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/xidogabe.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/22249794739.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/pijadajokupivatoxidazixid.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/15752143971.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613094134f3b3---rorivinopo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/wugepomikivebebu.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/memuxo.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/polikujase.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/96814676511.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_off0000cb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB38 18004 bytes
SHA-256: 14c34375dd195e6f7f622ed396f52acfb89a027b5d6cdd921adb36e268cc29fd
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 11252 bytes
SHA-256: 1b1cd2ea7352a5b7495a70dff98275dc14c313c8515962fe7f3f0a2a9ac3df1d
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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