Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fef3696614b78f0…

MALICIOUS

PDF

77.7 KB Created: 2021-04-30 00:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2f480b47721050b31261ea55ef118d5a SHA-1: dbe9f1e728d71ada18cd34a8ffbbf79e78c7a86e SHA-256: 1fef3696614b78f0791ad6e10d7c42b85d0863e826c7e77a472f0c691aff9947
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+clean+alkaline+machine PDF link annotation
    • https://cdn.sqhk.co/fokofike/jeUhd0e/koduzesedifakofuken.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/hhvgiZx/gerukabazuwudefo.pdfIn PDF document text
    • http://changely.club/can_you_build_muscle_with_bowflexa8vsz.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/bhagavatham_malayalam_with_meaning.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/yamaha_arius_ydp_143_manual.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/88533488241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601d22c20fef8.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/joxuletasijavuw.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/widjjiO/90469170234.pdfIn PDF document text
    • http://hookup153.site/dudofemuworonexv6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5fdae11544c3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipulosi.atwebpages.com/case_study_questions_and_answers_mba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246e6dd6-d88f-410d-a1c3-07d76d0c0f48/which_equation_represents_the_standard_enthalpy_change_of_formation_of_ethanol_c2h5oh.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_6b963692fd964009b9e5e0602e3fbe21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/202dd0cc-79a8-42ea-aa7c-bf1bdaefc61a/gmat_study_plan_3_months_excel.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_9ee33ea26a664851a6ca5f5b3ec5add2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/043a9df3-edd7-4ee0-8892-213500d689ab/80079839716.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_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 4880 bytes
SHA-256: 8cfab9ccdf2cd7422b9982712f39e7458589bd5283ca68b943ec75c529c18e55
font_01_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 11056 bytes
SHA-256: 101adbc49afb8547487117125af5c7de45fff356fcdad306efdfeecc3d8ddee7

Open this report in the interactive analyzer, or submit your own file for analysis.