Malicious PDF — malware analysis report

Static analysis result for SHA-256 81adfe5271d2becd…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 06:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58da9ff1667c41a18c81fd6b527cffe0 SHA-1: 969ad5330899ab0f0ba2ecf35306e33ef791b646 SHA-256: 81adfe5271d2becdb85b045b3300b5753fa7a6f128d9de6d838eda857fd2916c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics indicate the PDF contains a link farm with numerous distinct hosts and UTM parameters, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://mehreganimaging.ir/images/upload/files/vawogesiden.pdf In PDF document text
    • http://omegapizza.net/uploads/files/rixesege.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://rileyillustration.com/images/agency/files/2807799339.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/xogavarobamulovefovu.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/nikosagozu.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/99458679318.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/4326500399.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/bavikugegipupesamixus.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/39520579545.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3d5b2ae05340f581c47548bc8beee149/6668324856.pdfIn PDF document text
    • https://ebooksweb.net/files/file/1045888247.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/52259467595.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jidigofigipowax.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210923011611.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140a41b32d48---mogebam.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nafozobarazolivijowotimu.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/130807281438.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/31756156648.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/68964191436.pdfIn PDF document text
    • https://tessuno.com/upload/files/61471d1b73fe8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=is+carrots+good+for+your+eyesightPDF link annotation
    • 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_off0000abd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E8 10768 bytes
SHA-256: 6b14a01c200f69754f8203b6b6c9ad895ba784972137c9c40c463fc3cd988eea
font_02_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 15936 bytes
SHA-256: 4517834c2fb2ebf63a3bd1a24b5f29a6a279e472f6a89e130f9652f6e256c19c

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