Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fb750796c4c123…

MALICIOUS

PDF

74.8 KB Created: 2021-03-07 04:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 42e5edb0a9f569e3a15832c054ebc6cf SHA-1: 4aa5b3d03614f83580a8dae50fd90cd4882ff89d SHA-256: b0fb750796c4c1232b10955b00ac214e0266ba02f1718dc8baf3896e8f0132d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://xezojetit.ru/wix?keyword=worksheet+lab+equipment+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445341/normal_5fec7db7b3ac6.pdfIn PDF document text
    • http://loxebosobudi.66ghz.com/bebofufogexasijame.pdfIn PDF document text
    • https://cdn.sqhk.co/wumerelup/jchdOg1/microsoft_teams_login_issues_after_password_change.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/bGjhjdo/12343408481.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/fhiTT5m/tan_bomber_jacket_mens_outfit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fcd0c1b72ddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5ff16c54d72b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5feeb7165c6e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_604423dc13a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379380/normal_6013cbac45181.pdfIn PDF document text
    • http://sixobenuzapezi.iblogger.org/54669228060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_603ba453b8d9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutejuviwolopis.rf.gd/example_of_works_cited_page_mla_format.pdfIn PDF document text
    • http://mewudupite.epizy.com/ap_world_history_2017_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf60719b-a8a2-471e-ae13-d74a48e01b6a/what_do_i_need_for_real_id_in_ak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669c493f-8a7f-4000-b5a2-0a08b151d2a7/58742988570.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_e2f1e62c80104b6da8051249724bc49f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98aab4d5-5b24-4649-8914-c19a61209041/how_can_atoms_or_ions_combine_to_form_compounds.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_79b6f3fbb26c4310aa0a0c430f24623f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09624e0-28fa-4878-a005-3675d1d4bd47/surazujiduzuwulebibu.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 5596 bytes
SHA-256: 66f298dfbd7189323416b75983eead20f1752bd4c62cf4601535d36db8ba5c8c
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 10228 bytes
SHA-256: f504b98d7dcda4b34d260cb355ee755c6fbcf3ffb369283e6f8777dc2fb8a6c2

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