Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3259ee44b88852…

MALICIOUS

PDF

86.8 KB Created: 2021-09-14 10:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 152ccabdd5b61f385c0687f8deb46792 SHA-1: 819f2d5dcd1af1a665f7f42ab7c11df596904f66 SHA-256: 3c3259ee44b88852ee2f974f17ee2818c67c4937a73c7b8132b78e547c05e5eb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://studiobaliva.eu/userfiles/files/sonarifexulopuviliro.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/0ahivhu6n199e417cbk9t7fiut/43390297231.pdfIn PDF document text
    • http://pactolous.hu/upload/file/nekagowaworiz.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/tubemaremononinarebi.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/mosejujusivukalas.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/98564216210.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/zafosakerodogomasalobe.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/nawulexotojozej.pdfIn PDF document text
    • http://spbi.cz/res/file/74935999515.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/35167015974.pdfIn PDF document text
    • https://777mto.info/contents/files/65757694859.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/pebezifuzekugosidumidef.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/tusoronumipulamekafi.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/tusowopuxuku.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/sakosejufewavedazasepalen.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210905123805.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/65735469834.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/71567737047.pdfIn PDF document text
    • http://atomleasing.ru/media/File/zoraji.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/14463991207.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/56847250594.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/libuwejezijaxemisorug.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/80502553727.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/98814361483.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fubipewefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=letters+beginning+with+vPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/dekol.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10308 bytes
SHA-256: 51e3af285aa1854208c2b62fb24673258109ca84400a18d79fddc973ad1665b8
font_02_sfnt_off00011dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD0 18248 bytes
SHA-256: cc00d32ce4d214b59f79dec2b395d9c9483ac38dc66f81b1e03421f1a5fc6677