Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c10b93fc9a6b3e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 05:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d63b0cf987c0dae5b4b6a1e15d043480 SHA-1: 0034488ca6844efefec4511a149f0f44a7259936 SHA-256: e5c10b93fc9a6b3eb0472d44432555a71fac05c09ac7a066c7495c3492107dc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://fier-forjat-valimet.ro/ckfinder/userfiles/files/45309402091.pdf In PDF document text
    • http://cyc.cz/pictures/clanky/files/wukufovusak.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/molevopukofebilufa.pdfIn PDF document text
    • https://digireg.es/upload/92205660394.pdfIn PDF document text
    • http://fullx.net/files/kinabuzibikiv.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/vavexizofodaw.pdfIn PDF document text
    • http://kyea.org/imageuploads/50486725474.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/63664171944.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/6631345806.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/62410922193.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/56401686973.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/petizelo.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/10964893590.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/nebotonenifefukabitakazun.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/50886731787.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc7d944f1---ruwesiwejojebiribit.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/bodoputelozufexa.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/jaronuzotadabovujekewedi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/57492597629.pdfIn PDF document text
    • https://keongracun.org/contents/files/53963314728.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/56384877079.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/27820010203.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/89318200503.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/gozazekisemeregatefijob.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/43080620239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+transfer+contacts+number+from+one+phone+to+anotherPDF 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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 10924 bytes
SHA-256: 7b9206a683e9cfa158aed82cc8bc222a20234f5eee9834d332a608039736fab4
font_02_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 18492 bytes
SHA-256: 9bb405892ea24fd572bfb866a10ba318540ec87921d0671788c6548874670c14