Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc24fb4be4150e9…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 12:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5871f87e1c310e8221f88e7ede8d7af SHA-1: 8e69496b696f20bbf97e027172635c1c22f23c71 SHA-256: 8fc24fb4be4150e9569916300cd8b3d3df97cc6ea0a41fa4caa86fb457967770
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous external URLs, including one identified as part of a link farm on disposable hosting, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=tipos+de+funciones+calculo+diferencial+pdf PDF link annotation
    • http://spamsmsgiare.com/media/ftp/file/tijedoxelezoj.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/63473797259.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/24311206988.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/99734153610.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210909105431_m59i1h.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/50140445694.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/fegelem.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/jodonekexifufover.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210903042138.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/22314216555.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/21601731051.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/17593544596.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/ruxez.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vadizul.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/xizunepoxataval.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/sadanonifepalobuj.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/31599516824.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/63481579078.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/kuponavozomas.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_5DA1C3476E42CC19.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/soparevigapazamur.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bd100d44d670c503c06a109531db8cce/fonolirirepo.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/55472269311.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/87136451918.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_off0000ba59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA59 17612 bytes
SHA-256: 2f39867d8c382f19468ac226f112688ac8ab185ac5ac84119295a1f0f36a9a84
font_01_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 10580 bytes
SHA-256: 623d736b6c486134c2a4b2985dd1140f2fab584d682a2694896db93a09cdfbf7

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