Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11db9f73db99836…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 23:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f4e2fbdfe268b62cd80a50f10ff8b05 SHA-1: 66dcd2c81a85573885a86cf6e1783c1e207bd347 SHA-256: c11db9f73db998362c229cbcd9ce242e6c5bfdcd56b301179d8d005f1d9b7189
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests a phishing attempt related to financial transactions. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/34d7ae522add717e1678b65d16b04c56/sikemikalomidedazo.pdf In PDF document text
    • http://dblbtech.com/userfiles/file/29277071821.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/39768620026.pdfIn PDF document text
    • https://angkagenap.com/contents/files/xazifofufakaranivi.pdfIn PDF document text
    • http://spbi.cz/res/file/93391221400.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/98859727938.pdfIn PDF document text
    • https://mcsfood.com/images/file/pikanumubonaz.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gefigekeviritag.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/81923949861.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/witopajixejavisaweliwix.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902035814.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/796112517.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/99280107244.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/97267848348.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/5481382918.pdfIn PDF document text
    • https://ksboutlet.com/file/files/74536944579.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/85506401273.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/fidewapez.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/042025be6aa1dfe3be6ab79ff75358d2/xefodejewivefozidafopu.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_A7512D3E075AEA0E.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/61486271128.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/5366332158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ig+account+privatePDF 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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 10452 bytes
SHA-256: 9676a667269562145104b858f775e066c288848e1fd8af34995e7379167f3aee
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 17524 bytes
SHA-256: fccd2faa4ad2550f79ac403c99c9e9a61be7d05ab52ce0d262e589c092df622e

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