Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57a61cc301e2c01…

MALICIOUS

PDF

77.1 KB Created: 2021-03-31 12:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b56bfdfba003e8249baf72f949ad760b SHA-1: eadf6708171902f3806a66486f062d99f04c77aa SHA-256: b57a61cc301e2c015bfe1c961e484fd570e6275c8fb4d5a99005b39c28ee7a35
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to disposable hosting and utilize UTM parameters, indicating a phishing or malicious download attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that this document is designed to trick users into visiting malicious sites, likely for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=5e+character+sheet+app PDF link annotation
    • https://cdn.sqhk.co/xaripisi/hGigkia/chemical_bonding_intermolecular_forces_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_604838b307e45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_604549e175635.pdfIn PDF document text
    • http://itdiscount.pro/lexoderogiwooue3q.pdfIn PDF document text
    • http://legendnat.space/cazadores_de_sombras_ciudad_de_ceniza_pelicula_completa_en_espaol_latinoj4h3s.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/fOib09y/jefurulodalitoruzikovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_60565b81abe77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_60571f9943d4d.pdfIn PDF document text
    • https://cdn.sqhk.co/savadapo/gjhBJij/23442135905.pdfIn PDF document text
    • http://pitushok.space/19709358025oy4g9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_603169a7cac04.pdfIn PDF document text
    • http://rakukoke.22web.org/79747157439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butevagowug.epizy.com/activesheet._protect_userinterfaceonly_true_password.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_6c9f4fee974a404494d8532dfe88bf4b.pdf?index=trueIn PDF document text
    • http://kuronodufanox.epizy.com/report_definition_in_business_communication.pdfIn PDF document text
    • http://sazexuxezife.rf.gd/podapexevikigofuximogoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8248a58-d133-45bb-abca-bb036aff1fdb/foxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046f3e2f-26cd-4f24-9869-e68d1add2c8b/the_taming_of_the_shrew_1967_full_movie_stream.pdfIn PDF document text
    • http://ribibepope.epizy.com/breach_and_clear_deadline_free.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_0c18686030ea4d0d985a5caec037ffec.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_9a3606be0e8840639a54095f804da758.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d882de71-d5ba-4953-9b81-a5ae4d1db8a1/minnesota_dmv_road_test_score_sheet.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_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 5020 bytes
SHA-256: e34a493e91c4bc262e90b7e04f456c2cdaf4bc9c48d880bdcedee36a0f0ba77d
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 11408 bytes
SHA-256: 77585e9e5eb4a407ffec188d3e4b62aa1a17d980ca7d9b1a58ed8b5697fc9da5