Malicious PDF — malware analysis report

Static analysis result for SHA-256 227a62b0135468e8…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 08:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7681914bf59ec78e54097d14eb1b05a3 SHA-1: a0dc5102ad52f9856be9b0fcd2c03b24b30f45e2 SHA-256: 227a62b0135468e8170b0b2d137ed27ab679787d346abc165048fcc2529a8cb4
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, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or credential harvesting scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://phaptangpgvn.net/app/webroot/upload/files/pudotabi.pdf In PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/66145929849.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/36874532523.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/93181729156.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45c0b78e3a25a188f35e22bde2d5141b/56230877618.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vegewikatukonisegumuweviz.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/98366776258.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/vurerig.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/vuporurixe.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/xegenuvojom.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/74564452414.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/rodotasafiwuf.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kimeze.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/71863780205.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/sofuzokavoleb.pdfIn PDF document text
    • https://masukpt2.com/contents/files/19461504327.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/92392337849.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202194145212509.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/gudamamutopemenagaridumo.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/30561926409.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/nemuzutisezolejewavovanu.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/35830665849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+enable+3rd+party+cookies+on+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/15082416342.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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 11104 bytes
SHA-256: 841be44948b7a394d89f640b9df7619b540605b4937182c312ebefec75e373c2
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 18108 bytes
SHA-256: 8abdde808ed81f125914db64e2d634cc2f6a2e7eb526373bf5c8d73fd7a02c6d