Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad6adc49093f170…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 02:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 18bef379dd4e61f52dd5b2d64652288e SHA-1: 6499ffdce3e73368566a786b6f2fc264c0c544d2 SHA-256: 6ad6adc49093f170cd987aecda0584cb29e4bdb0780764dd6e5670437d0ed392
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains multiple external URIs, including one pointing to an IP address, suggesting it acts as a lure to external malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous links on disposable domains, further supporting a phishing or malware distribution intent. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or redirection attack.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=flightradar24+premium+full+apk PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8102dd3606034a43b8009b05691206d4/94534109043.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/bexotiz.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/36077647043.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/3127776595.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/72855655513.pdfIn PDF document text
    • http://lecostationery.com/files/file/nagefewitit.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/rejilofasupinuwubikod.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210905_161732.pdfPDF link annotation
    • https://rosenstein.lu/userfiles/files/68885735511.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/nusugugatewigelikosew.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/13276203414.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/69081730183.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/mubirobivowagume.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/49475431905.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/13971174513.pdfIn PDF document text
    • http://khocabien.com/uploads/files/mawukomegudesejor.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210909152434849699djasmmsbizlz.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/kibusuvasovaf.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/53085627612.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/8404411083.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/ninubora.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/c1pob9fhhp8hkdkasq9j38t82t/bigezawelodikabazulipadag.pdfIn PDF document text
    • http://sdes.in/uploads/4219658628.pdfIn PDF document text
    • https://keongracun.org/contents/files/48518845213.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/bexezujar.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_off0000b605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 14328 bytes
SHA-256: 0416b650fd922e7aa25bb241e2b00aa87d3778c97f33f1ded254d7c73e210252
font_02_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 10920 bytes
SHA-256: 5ede47c24bc0c008fb06fe929ed34c16fc8fb7dfe8cae9bf01b16e7952c3005f