Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80af11ae5dd886e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 23:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b5bb98f5f3f592d392aaef38a0a5c09 SHA-1: 1b3bc14e8b6e2560bd080529b8d26ab114605ebb SHA-256: a80af11ae5dd886eb0173b2365f59f6010041e4a2375dd1093482a4aed3eb3c9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including one pointing to a raw IP address, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=garena+free+fire+pc+ldplayer PDF link annotation
    • http://cvsc.co/userfiles/file/fizegusogajadugenapoba.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/52708895555.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/momilejawawu.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/kedegelojinosisipabus.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c625b3b0---gipuxudupekopixipid.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/dokisiwitozaxololofozabiw.pdfIn PDF document text
    • http://lj-group.cn/upload/files/ragalugusegeweje.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/54142332982.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kawesumodozamope.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/kubumuxevevusesufarunejes.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/torebedasiviwetar.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/gapilotazi.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/35272603425.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ca850cf707---rilevazubopibulujumuwib.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/gizizaxuburexemim.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/50862557035.pdfIn PDF document text
    • https://ms01bet.com/contents/files/xenetujixuxi.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/11381480850.pdfIn PDF document text
    • http://hkalc.com/userfiles/56315114212.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/madibovusivozo.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/87815523561.pdfPDF link annotation
    • https://ibextrail.com/editor-images/biwobitumerolunomaban.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/66549270311.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210908_60193.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/31886671282.pdfIn PDF document text
    • 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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 10380 bytes
SHA-256: 32876ae5abd1b450b4f78fd026587e82100e4795450defe5b4ff9391bb54ea15
font_01_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 17508 bytes
SHA-256: 4862f10659cd9ff230057ceb514d0267ef5fee5be623ad77147af2a5305d1c9d
font_02_sfnt_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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