Malicious PDF — malware analysis report

Static analysis result for SHA-256 94be68f9cb1dcffb…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 02:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c841524287a6b4fccea29fb193121048 SHA-1: 4a98b83f429490f9e071d8fe86f0a12adc5a25cd SHA-256: 94be68f9cb1dcffbc42e006c5828e4cbade1211f04cbea939aa329d0c9131a2a
134 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to host many potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://crysiq.ru/uplcv?utm_term=save+apps+to+sd+card PDF link annotation
    • https://terracetemayonetim.com/upload/ckfinder/files/vinezorumaxitatur.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4c594eb3175e200a494e1f17bd94a4d9/sujesibojatusomewiba.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/dilezemavojenogajiladuz.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/pejazedunepurorefo.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/vumeganejolijopituma.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a7dbcf33a---dukorifivasujubu.pdfIn PDF document text
    • http://ledins.lv/cms/file/8322225209.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/83248813506.pdfIn PDF document text
    • https://ms02bet.com/contents/files/11431374112.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/rulepafogufafobawixun.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/womokejasabujovovovapat.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/26659359164.pdfIn PDF document text
    • https://dukupahit.com/contents/files/zexotikunoramez.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/bibifeseliwofolubejok.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/89720162535.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/18807345381.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/50789296008.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/5235570253.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210909074632.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/51094575470.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/66291713886.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/67860008752.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/retigagesabumu.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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10404 bytes
SHA-256: 9246361cfd7d15085ae34ac023add8d048f520bb35420223202b80181b00360b
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 17128 bytes
SHA-256: a7dfa0b9fa2f344ee44c8efdac5b0110c92b8982212519c64ea7868f66086e72
font_02_sfnt_off000137c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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