Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fecfb5e2601c4ac…

MALICIOUS

PDF

80.6 KB Created: 2021-03-17 06:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 95d3163d03211d62594054bd52efd65b SHA-1: 0270b59d13be23b9d05e6eafbba398809a3720e5 SHA-256: 8fecfb5e2601c4ac702331fd7d8f8a3b24c49514c7bc71d91984ee082ccc44d5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to suspicious or unknown domains, suggesting it's part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and redirector patterns, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=grade+3+spelling+practice+book+pdf PDF link annotation
    • http://alsamcctv.com/ismart_dv_appqknqk.pdfIn PDF document text
    • http://smeh-mif.space/aptitude_test_questions_and_answers_in_tamilslp0m.pdfIn PDF document text
    • http://abanca-electronica.com/cartes_du_ciel_linuxri83m.pdfIn PDF document text
    • http://yoga-fitness.space/american_gods_season_3_cast_imdbh5r8g.pdfIn PDF document text
    • http://hushseo.online/ryobi_ryi4022x_generator_reviewspk9lq.pdfIn PDF document text
    • http://uorott.com/bose_companion_3_series_ii_wattswwdly.pdfIn PDF document text
    • http://daliadiago.com/tamoboxktszf.pdfIn PDF document text
    • http://santaparker.store/tiludemovaxuyelmy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_6012e32bc78fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_5fe6c7bbd4872.pdfIn PDF document text
    • http://richteam.site/9160855028bc45e.pdfIn PDF document text
    • http://telgrm.site/duravuxomizerudunasonulifps81.pdfIn PDF document text
    • http://rubeatyshop.xyz/bmtc_application_form_bus_passmtdu8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ff7a12e43907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fd2cf858a578.pdfIn PDF document text
    • http://artistichomesolutions.com/ff14_class_guide_20190n8ql.pdfIn PDF document text
    • http://hookup153.fun/montaigne_denemelerzusoo.pdfIn PDF document text
    • http://seamanygau.best/databalugotild09nk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sikuva/undertale_genocide_level_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5811ad-79bf-4bbe-a4d0-75f49d9c624e/is_quartz_a_good_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5e83ad-eccf-4bf3-95db-7639da0b3841/what_are_the_duties_of_a_special_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07d9a05-b65f-44c2-ac7f-47dcb1514d04/software_development_project_management_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/hangouts_chat_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d7c4c2-b229-4d25-a434-03230dfbb159/64984292404.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_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 5724 bytes
SHA-256: e795a3d6c3045e842278f2efa32fcc3a1fdb86fc5fc5915f60d8bf90d7d2b10a
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 10588 bytes
SHA-256: 49d0620b3e6a88a8469ce404f250baaa2bf3316a9c5525811c3eb438b09f5d39

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