Malicious PDF — malware analysis report

Static analysis result for SHA-256 be44b64f365bf4a6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 18:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6adc15989e89b44a98aadffb732e3e21 SHA-1: 6f726d6e8fdb4300b0a3bad2f98805447c8d92bd SHA-256: be44b64f365bf4a67f625027b55c79c36eaf62c352f144fb7958b106abe5bcfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://stjconsulting.it/userfiles/files/pibabaxajunonunipiwikagi.pdf In PDF document text
    • http://hanhthien.net/uploads/file/47938652503.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210910_000357.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/82706304883.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/guvituv.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/lufatixusanatizebosi.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/nuvanurefaxaxejumiza.pdfIn PDF document text
    • http://osayit.com/images/file/gajekagi.pdfIn PDF document text
    • http://sushi-belovo.ru/files/24737755052.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vesetudovunuzegigewe.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/36233814996.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/tukejifovisuwezaz.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/pisawezawax.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/witimitorekuwanovipabido.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/64570186618.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/15004618472.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5d25307c---4921447515.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/38287918385.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jevipigataguzorapu.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-02-06-57-19-34.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/54609579599.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/44507475851.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/guvumosumigoxesi.pdfIn PDF document text
    • https://akemi.ro/hirek/file/babetatozenajetat.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135545ccec10---ligalezujozerugusivinip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ookla+speed+test+apkPDF 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_off0000bc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46B 10208 bytes
SHA-256: df9ca9023fff0be4f4b43279dbdb5453cf78e4bcc8ca85d7fb3ade7a5f4db708
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 17288 bytes
SHA-256: f320beecb9732dc3be9f03852249c027ebc4e01e8c9fe2781d8d51d9739d14a4