Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc77d4ed3bdeb03…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 16:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c91bf24fee231bdd9daf4d8dcaae70e SHA-1: 9f40cd8166a8ce25d872f7679caded0e6bb68e71 SHA-256: efc77d4ed3bdeb03c805fb2e658680aae1bcdf9cd456bba7de8591bcec73a936
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The high number of external URIs, many pointing to disposable domains, suggests a link farm or phishing campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://darstin.com/userfiles/files/padoli.pdf In PDF document text
    • http://kientrucnhacuagio.com/upload/files/34268869483.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fevosogusaxisudakejoduz.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/fasuxepubifo.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/77025607254.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/kikimagivemoki.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/97631708924.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/94535539424.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20210917_51BD04A44F4C3E50.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/34718817876.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/dozowo.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/puvelubaxivudofijuz.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/wanudin.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/25288127137.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/janijixiv.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tilap.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/liposajagot.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/68700158535.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tajogaxok.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/segawebuxexoz.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/53759678756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=twilight+saga+full+movie+freePDF 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_off0000bc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC98 16928 bytes
SHA-256: 6b777fe417162aa1ab9358bbccc867322f98130c074ead0756d8c1af990675bc
font_01_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 10772 bytes
SHA-256: d1eaaaf67b2af286bf035190e5106f23154be8389c252647d386b681794574e7
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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