Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b3636a328405db…

MALICIOUS

PDF

70.8 KB Created: 2021-10-07 22:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 15988ec8d4c9f1bf6eb0a21901383559 SHA-1: 67f0efc55c79e9fd467072556aa788f4afd17dec SHA-256: c9b3636a328405db22c8680f9e3625cd628720a63a5e3e00de2e26a66913dc29
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pixomot.ru/uplcv?utm_term=usps+first+class+bubble+mailer PDF link annotation
    • http://www.gulbaharsigorta.com/contentData/file/borar.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/fopuru.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632356799.pdfIn PDF document text
    • http://nakajima-ya.com/user_data/image/file/55094899842.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/daratelofosezabelasuf.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/24280332781.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/worafonojupotime.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/petujuw.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/buxirepiwakawarumezik.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/79696976471.pdfIn PDF document text
    • http://e-menu.hu/editor_up/koladogamepugiviwakapa.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/74414539603.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/43bc406b102b5930089858731433c7cb/37833437428.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/papepofel.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bojugojafabi.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/wavanu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/pexifelurevomegivugel.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/42247269217.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/wizizovane.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/17089703104.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/31145404698.pdfIn PDF document text
    • https://insp.biz/img/file/nakobumolixus.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/48306665474.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/28524308405.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210912011548.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/wupizikumurimudanasola.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/83105853472.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/10797264127.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_off0000b718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 10664 bytes
SHA-256: b3205fdcfe13a9c4eebd45c24199c204f5f3ec8e3b8510ee09207329e1f44b19
font_02_sfnt_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 15100 bytes
SHA-256: 8c43b952b0ff41218edba98b08ca33f83a356ddde5d87535443d4cc3f3c218b7