Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cacf38e7239e3a4…

MALICIOUS

PDF

80.8 KB Created: 2021-03-28 02:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6d12c543ba3d36966f1cac89aa621ff1 SHA-1: c609c437749c26f6cee06fc7f400655f4126c8fa SHA-256: 2cacf38e7239e3a414426670dbe649d07964f3f2b43211500742ffde637b42f9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/award?keyword=ebcdic+code+table+pdf PDF link annotation
    • http://xapiduxirob.mywebcommunity.org/8403281053.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/punctuated_equilibrium_example_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_604f7fdfb2be3.pdfIn PDF document text
    • http://italywow.info/zudeligijukipusinad6lij0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fccc2fd238f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_6048ae092c05d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366057/normal_5ff1fb390f5ff.pdfIn PDF document text
    • http://danoguvokapijof.medianewsonline.com/rotewevosamusezug.pdfIn PDF document text
    • http://dmgameplan.com/anbe_peranbe_song_wapwon_liveau8nk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_60000bed4723e.pdfIn PDF document text
    • http://goldalbum.ru/what_should_blood_group_b_positive_eathm60a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gometupibi.rf.gd/how_to_use_a_generac_portable_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973e0e94-8984-42c2-9bff-5fb40941aa6a/ladin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3f04e2-d0f0-4331-a1ca-c9f18361b0c7/satipatthana_sutta_analayo.pdfIn PDF document text
    • http://xejawaji.myartsonline.com/kalunubodapimupakepewip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f39c2c-4494-4ae4-9680-02c6de7a8cbf/oracin_al_espritu_santo_pidiendo_sabidura_catlica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24397698-a9de-43a5-b857-a6efc3ee1c5f/6200322926.pdfIn PDF document text
    • http://vezuxafafifobo.epizy.com/86775364891.pdfIn PDF document text
    • http://xupuwineris.epizy.com/ruzawetisuwenixeko.pdfIn PDF document text
    • http://dawovizi.epizy.com/meposepufin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d47b28-3b5d-4773-9021-4d40e1fe5d32/arrl_general_class_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4206d75-2b7f-49fb-97f4-1ae686a6cd22/riromedip.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 4972 bytes
SHA-256: 959c52b9679cba09f3d96a9b00bf19ba7c058a7a2dfaccd6380fcb45ee8a501d
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 12860 bytes
SHA-256: a29fee36a00c112d2fd1f1a454f8fc98bf3d1eb5a8d6bcaaf03c85a6aa5b7bf9
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd