Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a1107afb438e17…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 07:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 145ba1ef35d779e75345f31f29765e6a SHA-1: 62f51d0896b9698c6f827def4e6cd8fd0d982d0a SHA-256: c9a1107afb438e17445a979897eda9840cea883c9e65490d27dd9718164f0c6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature, pointing towards a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0d14a178666c940031625c5c90e88c58/53393810564.pdf In PDF document text
    • http://mama-care.com/UserFiles/file/40226779167.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tikemodizirofikugudav.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/zolojafovulidisazififid.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/binegodilolajuz.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/siwitetaretozuza.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/72654653371.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/46338646599.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/kunipifesaba.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/zefebim.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/74410397447.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/51433060627.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630907729.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/vizawazabut.pdfIn PDF document text
    • https://theipbuzz.com/images/file/lebiferiturunesex.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f6a02f2421ed1f56f1fcffb36037371b/sotutuluwoneruzum.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/88029146828.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92417893943.pdfIn PDF document text
    • https://solturism.ro/images/file/jeguka.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/35760596941.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/99888801341.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/42241382076.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/wajujos.pdfIn PDF document text
    • http://dgjst.com/upfile/file/57559582476.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/65641318589.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/mawufuwobejuvanef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=my+hotspot+will+not+connect+to+my+laptopPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 18904 bytes
SHA-256: 5619008de0f1bcd9f3f5c87ce6a1a3f0f3505c65f0ab1b0cb07dcc20a50f471c
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 10732 bytes
SHA-256: 0a584a105b5c4cdc7e02360bff211dfce4f5f622720bfefa3a13bf8684b2ea26