Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7b4540997c3f96…

MALICIOUS

PDF

75.1 KB Created: 2021-09-27 04:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54398950890a25ad769bd7ae6dbcfe7e SHA-1: dada976e3b1762d1486615068f812e0e7ed56896 SHA-256: cd7b4540997c3f96f0f3734de328319d1c898a52f6b8164954628eb7b3ca01b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=skip+ads+pro+apk PDF link annotation
    • http://yeosingol.com/FileData/ckfinder/files/20210907_30EF26F79019C739.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d344e0c95---41478948186.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/20117084024.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zogobadosasololabutawipek.pdfIn PDF document text
    • http://i-dron.cz/data/file/bivibimig.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/fowufomib.pdfIn PDF document text
    • http://stattus.com/assets/file/81009233311.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/jobegivisuzazukuse.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/91293096283.pdfIn PDF document text
    • https://ms02bet.com/contents/files/nuwopurizosukotuvemato.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/99528050073.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/99757135087.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/53855168746.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/73871548311.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e24381de5ffa439792126ccc9b459e07/56590997821.pdfIn PDF document text
    • http://vaynhe.com/upload/files/kigavidewegalelipugutad.pdfIn PDF document text
    • http://tfforming.ru/d/files/petadigida.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/71147331376.pdfIn PDF document text
    • https://tadimtursu.com/image/files/35582741828.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/26752711789.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/geneperugarimovegoze.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/82589114321.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631303975.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/popowopunenum.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_off0000be84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 19100 bytes
SHA-256: 8b3ccddf8d300e20561b603fcd4706fb524e269cc452bd5d385d5200cb5f57ec
font_02_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 10172 bytes
SHA-256: 6dd0caa6e0dec796e40d78f34223446b1b3b958d12b3de34e1a96de5c33adfed

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