Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0591c6c22ecca6f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-29 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d113ab0a04a64bd791e58e17821b118d SHA-1: e29f322b28f4e502b6ff324552483e25a82f8f3e SHA-256: b0591c6c22ecca6fad2f351e66754b22528d83671947b061f64bc77393752b02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, employing an image-only interface designed to trick users into clicking a malicious link. The embedded JavaScript stream and the high ML classifier score indicate malicious intent. The document redirects to external URLs, such as 'https://cructi.ru/uplcv?utm_term=french+past+participle+of+avoir', which are likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=french+past+participle+of+avoir PDF link annotation
    • https://viktorina.ledoritulys.lt/files/wezetegerozuloxomajilu.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/guganorekuliv.pdfIn PDF document text
    • http://cke.hk/userfiles/tawabapavuwesa.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/juvenekugika.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/kepizepifiwiku.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/83938432627.pdfIn PDF document text
    • http://sbairs.com/datas/files/sebuzilalirijaxidabobeve.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/92102318450.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/nisomolajapefomiluxef.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/magugasipofutog.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/63581165898.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/zezaguradekuzu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/23460609542.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/pifoza.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145564ecda6b---fumorofinoloripimop.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/defariloxafemasajudunepel.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/81103775321.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4dgmsr32268l72l5qgj0kqlv92/woruronukikusa.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/xekugekinokesesesodosamad.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/37543891371.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/jototomurunowo.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/15301157984.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109161253393410.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6961576497.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/tilajupiruzedovibexapufu.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/perosozo.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_off0000b0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AD 13964 bytes
SHA-256: 6b7917690cc87267fc0b9e2679f15379ff4238c5967c74495a636a55c81249ef
font_01_sfnt_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10620 bytes
SHA-256: 7bce7d354da491442fef27d25e2449e536e20ff178d313bf5e8ff6529a0c4ebf

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