Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c85db5a8efcae0…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 22:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a8fb209f38fc3c021349dabdd9b30155 SHA-1: 23eaf3e566c52567f7c855a929fe449378f6b7a9 SHA-256: a7c85db5a8efcae0d1df34494142effa455b19489855b7e12218566e13936a9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users. The high number of external links, many pointing to disposable domains, further supports a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://upoart.com/ckfinder/userfiles/files/88234320908.pdf In PDF document text
    • https://martensmgt.com/business_school/uploads/file/senaladefiteditev.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/malizukojunisir.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/nosijadepuzojozevinamu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zujejib.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/97667746994.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497491c3984---9661114246.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/47721140440.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132231a34dc5---zemimobivafubakaterun.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/41872316132.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/33432015582.pdfIn PDF document text
    • https://conrays.ru/f/data/sexusavevawovawi.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/75735126083.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/3859008217.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/kolobodowev.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/novalenusonelipovaweg.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lovodowobesu.pdfIn PDF document text
    • http://zaiger.ru/img/file/3554383499.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/metanuwukos.pdfIn PDF document text
    • http://hexindechem.com/upload/files/mebolivo.pdfIn PDF document text
    • https://tempegaring.com/contents/files/26981685429.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4spqdi0gv9prb747980tsoej5c/43614150720.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631755929.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/73459613718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=borderlands+2+legendary+weapons+codesPDF 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_off0000b678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB678 17564 bytes
SHA-256: edd20372f96c14e74f80142119689530a83ccdfc6279ae5b5bbd08897f7732e4
font_01_sfnt_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB69 10872 bytes
SHA-256: 65a6454fb920ddd435a0b012fe7cb4108741e74c439aa2b27ffca1959c0ff037