Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ef49a2946b89d9…

MALICIOUS

PDF

77.7 KB Created: 2021-06-10 11:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 453110c70c3ef06f22a6c4227e800e62 SHA-1: 12e3647d587d43a3890bf018022d3980347f6c69 SHA-256: d5ef49a2946b89d9e48828a771354d3ba26d6222039949f413aeb9613fe01128
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various websites, some of which are disposable or used for SEO manipulation. The primary malicious URL identified is https://oniceh.ru/pbw?utm_term=e+balagurusamy+ansi+c, which likely serves as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation 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.
  • 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://oniceh.ru/pbw?utm_term=e+balagurusamy+ansi+c PDF link annotation
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/5607783.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/nevifaza-nokotowakojilur-dukareb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_603ee46062110.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/rizudiguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_602e2a2e709d3.pdfIn PDF document text
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/9e7414e.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/185c3ef893f1673.pdfIn PDF document text
    • https://vokoziga.weebly.com/uploads/1/3/4/3/134389491/b4639aad3b8212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6058fb05c378b.pdfIn PDF document text
    • https://natemavobu.weebly.com/uploads/1/3/4/3/134349428/2561110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibuluwopo.pbworks.com/w/file/fetch/145003998/63807006570.pdfIn PDF document text
    • http://depowota.pbworks.com/f/soluciones_isotnicas_hipotnicas_e_hipertnicas_que_es.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/can_you_retake_the_patronus_test_on_pottermore.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144659712/moises_y_los_10_mandamientos_las_plagas_capitulo_163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680f2c33-89ad-4eb6-ae2a-5a7cbd0ced7d/what_age_group_is_the_book_holes_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e83af75-9bbf-411a-b81c-2c7304f95e48/52202647813.pdfIn PDF document text
    • http://pevaludim.pbworks.com/f/wagaxena.pdfIn PDF document text
    • http://fezosubi.pbworks.com/w/file/fetch/144780942/how_to_calculate_volume_of_liquid_in_a_sphere.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144673560/48750153817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6031574-d59f-49f4-a9bf-8936ca349ce5/98309402829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f9f260-fb61-4b7b-9c05-666e5d5f4032/mekawoketaxo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 5316 bytes
SHA-256: 868daa51526400b16f875aa658969f9c581b979494a1af30b56ad002a470c607
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 12452 bytes
SHA-256: 5ede784f1a86c9616311ac4b24f076cbba6aafe6d04a6e1e93b4d0c274fc33bb