Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6b0091228d2bb2…

MALICIOUS

PDF

79.1 KB Created: 2021-04-03 22:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 41f9aaad956f9571f608b95068b1ace6 SHA-1: e1651649cf1337533bcac69c0cd912374413c77b SHA-256: 5b6b0091228d2bb293df9019859a3641e3b3eba896427d5cb337f4949b046e29
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malicious redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=campbell+biology+10th+edition+ebook+pdf+download PDF link annotation
    • http://youralteragoods.com/63751219289w2ka6.pdfIn PDF document text
    • http://fruktovik.com/51395683113sljfp.pdfIn PDF document text
    • http://nextauto02.ru/apa_style_single_or_double_quotation_markslfb1u.pdfIn PDF document text
    • http://kulanonalum.iblogger.org/78788843916.pdfIn PDF document text
    • http://pevawafo.iblogger.org/tifavijamupigejubezabajoz.pdfIn PDF document text
    • http://everydays.space/jyp_trainee_chicauksnd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec7750b-d7e3-4dec-89c4-136eee3ff162/quadratic_equation_graph_standard_form.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_78a0d14c66a7473bba3b622ab3c18c96.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_0c840e842f3f4f11abd2bf1b4b0a4e15.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_ccfbc5cbacf049eeb951ffbd29d08f90.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_e01e8ed1e88e4711bd22b7acc164505b.pdf?index=trueIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_979cf738403049eebd8e04210d4816a4.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_f0f3cf306a624ed9b24b096fe52abf06.pdf?index=trueIn PDF document text
    • http://muparokaxewidad.rf.gd/b_a_s_i_c_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e44db1a-d725-4b94-ac91-c4ed0cc0e022/30860163071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91442ef2-8605-46d4-bb4b-bccd3cfe1837/panasonic_customer_service_phone_number_uk.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_228f30d5633b44adb73c613ef050afc6.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_7c360757e53642a08dafa39d6bd825ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f74b79f-d416-460d-abcd-18e95bf94ee1/vemevuwokirisisujoji.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_13e176f4a87f47479d7542cd8736174d.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_f695f81b2c31431d909ea42abd9924b2.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_04e01abcb26a46909c7c1c5ec1867cc1.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_d38cbb1026eb422faa2ba7f796e8ec5c.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_45e054167378431f8b38593bd2a3ccc2.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_6cdae3277d8646bc8f1332d6f6d6f3e8.pdf?index=trueIn 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_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 5676 bytes
SHA-256: e07958f848d34e0a1ca40d61fb08c5bdc74ad0a9e2144de6786b539d76e52569
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10880 bytes
SHA-256: fc289df502e322bc64263046dc5ed5c1b566fa414efdd434394747d53e620ec7