Malicious PDF — malware analysis report

Static analysis result for SHA-256 f679128404334677…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 20:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5bd2086ef3a189573af76da36322868d SHA-1: 4b1a45979ce0ead0c0477142daf47324811daef5 SHA-256: f679128404334677918d74bc06e4b3d83b6ee8b175262a74f7910490eddc8c6e
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The 'SE_INVOICE_LURE' heuristic suggests a phishing or scam attempt, likely by directing the user to one of the external URLs. No scripts were extracted, but the presence of many external links indicates a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=tca+cycle+pdf PDF link annotation
    • http://farvestnn.ru/guitar_blues_scales_chartx85yg.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/animales_en_peligro_de_extincion_en_el_peru_2018zf5ss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_604504cada706.pdfIn PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/426a2b57b96.pdfIn PDF document text
    • http://cafe-cok.ru/what_order_should_i_read_the_warriors_booksrl9xv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382793/normal_5fc6c60b68763.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/1Guhihq/chicken_run_2_cast.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/8300270.pdfIn PDF document text
    • http://leoidet.xyz/mckinsey_global_institute_future_of_work_report6qqk0.pdfIn PDF document text
    • http://jetulugu.iblogger.org/wilderness_survival_equipment_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_603e6ae5d80e9.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/jyCnjgn/talking_tom_cat_2_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5fd3c304e6efb.pdfIn PDF document text
    • https://jubekese.weebly.com/uploads/1/3/1/6/131606730/5839408.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c3805da3-5124-474b-96a9-6426d2c92e0d/nakakexadoguxisison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96337783-0ab0-4124-8f05-4990bb3aa35f/12461160354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18262804-4a70-439c-8242-d64a485f082c/wonder_palacio_book.pdfIn PDF document text
    • http://gilemexuwef.epizy.com/ajenjo_planta_medicinal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87685e1e-7f1c-4c8e-bb01-1627c2f8ed95/jegexavu.pdfIn PDF document text
    • http://memavopunon.rf.gd/tokyo_guidelines_cholangitis_diagnosis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 4368 bytes
SHA-256: dfc2d62e3d371952acf31b7802cc092d2e06b1c7e1b0b6018df450600b299368
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10212 bytes
SHA-256: e8a063791c83a9ef9e66977796d20186b38ce71956e41b232b7e13f67223bca4
font_02_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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