Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a895220f24cf56…

MALICIOUS

PDF

81.5 KB Created: 2021-05-08 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 33f2e212d89dac9995d70b60b1f714fb SHA-1: 1b361a55fe60566f2fcc5592aa539b7a5e8ef76f SHA-256: 21a895220f24cf565a89e29db8a7d9c08c7037ac08b7dfd6482eabc56136e1fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jottigo.ru/strik?utm_term=solubility+curve+worksheet+ks3 PDF link annotation
    • https://cdn.sqhk.co/wugunifikezu/c7u0jds/dodecahedron_template_printable.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/biography_books_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/givefugonuw/hgigjgM/riwefaxodowiz.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/19606636872clrg0.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/cantos_del_camino.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/KJIjgGu/piturexititaram.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/bufununetelal.pdfIn PDF document text
    • http://lonagonem.22web.org/school_subjects_in_english_exercises.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/jubut.pdfIn PDF document text
    • https://dadikokaw.weebly.com/uploads/1/3/5/3/135347495/1097684.pdfIn PDF document text
    • http://supportcopyright.net/what_is_folk_culture_in_human_geography4pbbc.pdfIn PDF document text
    • http://winoraama.space/2007_dodge_caliber_sxt_repair_manual45idm.pdfIn PDF document text
    • http://belldiscount.ru/o_que_caracteriza_uma_transformao_isobricavcd8d.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/40527830241.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/j5ifidM/the_lighthouse_robert_pattinson_accent.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/dhbyRje/tepotaguzinupa.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/8983509.pdfIn PDF document text
    • https://tapizijivuvol.weebly.com/uploads/1/3/2/6/132696465/nabasagudeja.pdfIn PDF document text
    • http://digitalmicroteter.xyz/maria_valtorta_libros6d5mp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wovogaxix.epizy.com/egg_embryo_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9818ed2-3ce2-4e0c-8a5e-0640875d81ac/first_grade_math_curriculum_florida.pdfIn PDF document text
    • http://pawegafed.rf.gd/numamisapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7198a8cf-806a-490a-85bd-7944f39d295b/16923479218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d1ffc7c-7fce-47ff-8f3b-8ba52e11add3/deminamasu.pdfIn PDF document text
    • http://lawekapijef.epizy.com/13176335656.pdfIn PDF document text
    • http://xiwexuxe.atwebpages.com/8099253411.pdfIn PDF document text
    • http://medexode.atwebpages.com/whats_the_best_drink_to_mix_with_crown_royal.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_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 5400 bytes
SHA-256: aa6443da074d2efb37b420e62bc210ee09eecb569b9797dc897d4a11ba23259d
font_01_sfnt_off0001110c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 11916 bytes
SHA-256: a8d9a7e786ddd334335fb39c25a9c729ceb28edf135533dc9c2914ffb3cfd8ea

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