Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa09098f3bced39d…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 15:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e5c40cbca01a61128f57529342d4344 SHA-1: ee8c39432972345291bab26b52c5e4f20e2f76da SHA-256: aa09098f3bced39d4425ea6baf5854a0ea395165330866efaf6f04c7f372e02c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://culvercity.ilovepokebar.com/uploads/files/36393909025.pdf In PDF document text
    • http://imailbox.nl/images/uploadedimages/file/buvuweberudizizik.pdfIn PDF document text
    • https://zzhqhi.com/d/files/30306017837.pdfIn PDF document text
    • http://gensugroup.com/upload/files/keninusitize.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/nujivifuri.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/numewarexawiwor.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/63114745333.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/bexuzus.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/77057845629.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/gupivigafuxasepog.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/58217249095.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/56784326389.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/tovogovejikabagumet.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/nakafiritu.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/rekogolusewemumajag.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/61060601836.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/95513465293.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/nosuvumedazakir.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/51685594194.pdfIn PDF document text
    • http://budka39.ru/files/54016711741.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/dexevesolikorina.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/59895758140.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/warazejisi.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/vaxeka.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/51bdb02aba85f2a32252c61f9316332e/gilalexovadas.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/61244839891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=omega+rom+s3PDF 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_off0000b41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41C 16712 bytes
SHA-256: b42783921f649782069cf16bd2f1951e6f9af3d3e6201ad675ea19d41caaac35
font_01_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10308 bytes
SHA-256: 1465963d31590bb9a47728012eb36cbda7cb6b5d92769173913bb2de7c4d89e8
font_02_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1