Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc4a67e0f7e4520…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 05:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a03a292df9e301b170838f420364bd82 SHA-1: d03a70632c9d92f02ee7a983fa6bd9bb849c328f SHA-256: 1bc4a67e0f7e452061be0226dced7e009ed3cc6e3399027a806e43e7916916d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=how+to+cast+android+on+windows+10 PDF link annotation
    • https://sunnyrosesschool.com/userfiles/file/31060875927.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109021921478966.pdfIn PDF document text
    • http://dalaichau.com/files/natobo.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/jevomozabesadat.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/99389189552.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/babumerugukix.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43fb750b4---9411023032.pdfIn PDF document text
    • https://ip-pharma.net/data/files/legifu.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/zunelezukizakan.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/62219274106.pdfIn PDF document text
    • https://polaria.cz/images/file/butimupo.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/5977415798.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/wunebigoxipumizerisazebo.pdfIn PDF document text
    • http://budropol.de/Upload/file/zewabewetujeribezijej.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/vaxudasudoxeter.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/vodilawadumalate.pdfIn PDF document text
    • http://wjcopy.com/upload/files/pikemasoluwosisusenoz.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/44397806925.pdfIn PDF document text
    • http://vhktn.at/images/content/files/73048877068.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/2825327471.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/39340288411.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/19405589559.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/vezezitisijimufewura.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/lexebore.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_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 10436 bytes
SHA-256: f158659b3e45949993ae46fbe5f7a24b71d62a128c02441bd4c22495376299b2
font_02_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 18052 bytes
SHA-256: e1c7a495c5a796bc505a3a2851f87ff778cb29f6fad3cc753083b62d64f7e8d1