Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b5424340907a03…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 19:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76563e9fee0bd3d26f2e038f3781aaae SHA-1: 9fafd26dd9bbdfccba6722b297fb38ec2e812e97 SHA-256: 77b5424340907a0333a320c41a4357ac3f991605cc90a784d507fb64717c1ce0
134 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 phishing or trojan threat. The heuristic 'SE_URGENCY_LURE' suggests the document uses urgent language to prompt user interaction. While no scripts were extracted, the presence of numerous external URLs, many pointing to potentially disposable domains, reinforces the likelihood of a phishing or download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://peiitw.com/Upload/ckeditor/files/nawazarozobawid.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf1a68f9f---2693046569.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/nujogajitosulafa.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/mijelozebojugapu.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rubor.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/kazajunerinovizuravopuse.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/15047264283.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/luzibujojimi.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/83982885436.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fijojow.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/35713265195.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8a591f04d73605e8e044e4553fcd0f85/pafowilobejuxodajutu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/xokupub.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/63644827062.pdfIn PDF document text
    • http://ty-int.com/files/files/disulogefe.pdfIn PDF document text
    • http://tecksco.com/upload/files/16992293925.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/25214504511.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5234306130.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/81352892651.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/4199513420.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/bumiwepusabobeluk.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/62884475303.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/67689421387.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210903001458.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/87458162388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=contacts+from+your+read+only+accounts+cannot+be+deletedPDF 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_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 17400 bytes
SHA-256: 875385a8373c8205aca3135285e805ab1079194528dec46159dc3051f3d3f6df
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 10932 bytes
SHA-256: 60b73b6ca3bb0e1a7717a25a66979770a2ab49a86e7fba6848a58a6ad24400e9