Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e0a536706ff3db…

MALICIOUS

PDF

73.6 KB Created: 2021-09-12 21:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5975f8167f2bac40d2a69171cbc09c9e SHA-1: 4b55068086ff1c70acf449cd5084f263418229fe SHA-256: a8e0a536706ff3db6ce9ea8c72ba2ee3917b616a00d7cc405906c4070a7db283
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to download malicious content, potentially disguised as a file manager.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://szamosiszerviz.hu/feltoltott/files/nadisupaxez.pdf In PDF document text
    • https://combrooncom.com/contents/files/51490328464.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/jijozeju.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/49413966147.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/73350667100.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/84999307767.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/mazogiz.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/86044456284.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109120910225251.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/77219011938.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/27541774665.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/soxivevat.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/llfrne4qg08a7k3fo6tleesgmr/96153459716.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/zijuguf.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/8923286412.pdfIn PDF document text
    • http://agavietnam.com/img/files/28685902156.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/risid.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/74857742745.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/rakekoxigidesixinazudupom.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/pafulotige.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/92439437060.pdfIn PDF document text
    • http://gzwep.com/img/file/20219834659.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/zuxaforobexagabowemapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=zip+file+manager+apkPDF 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_off0000bc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 10372 bytes
SHA-256: fd35fdb2ba19da7f34dd64be728df44abcde8751d22c06858ce0174584d9de9c
font_02_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 17516 bytes
SHA-256: ddcc563b545be760427b5eedda31392c24e7f863d5a787bfe3d7da012a7fe865

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