Malicious PDF — malware analysis report

Static analysis result for SHA-256 c460c74505ba2be7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 16:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dda825929e49bb39cf1d7745cfb95e0f SHA-1: 208d1038713d73a901839bcb36baedf89b9ce5f7 SHA-256: c460c74505ba2be7076109ce88f23051fd272ff93b4a74f920e1a11c7631b141
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=gta+3+cheats+pdf+download PDF link annotation
    • http://www.niceresidence.net/image/upload/File/12645996312.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/27958086563.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/58069656373.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/96934538270.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/fukujizagekuzu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/zukuxateku.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/buzumuwuvolatesomurotoxon.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/84574327320.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/lenute.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pumedifun.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/mavupemixerabu.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/86418634725.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gizugeluzutupukasul.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/rolatipugoniladunud.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/tefozikukim.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/70053458142.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/80467577240.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/lofogidodesepurekin.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/44110202223.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc525c4d6---nevuf.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/miliwir.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/filitirupevobabore.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_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 18660 bytes
SHA-256: 6fcd48db62518a433d6c14d8c9d3354cbd96990dff82549143bb67d34adc691e
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 10820 bytes
SHA-256: cf5e16f72d4552f2c4bb8623c7e5a231c3bbe74bf5bc4543434f6fd5d5fb0b97

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