Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79d8b58bc1cfd6b…

MALICIOUS

PDF

71.4 KB Created: 2021-02-15 11:37:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 47a3c03353d464bbbf1035018d972013 SHA-1: b09d383213db80520a42180fd8a9f67ef5e27211 SHA-256: d79d8b58bc1cfd6bdeaa851163ddaa1cc8df4dd42bc81eb988c8be3d75019dd2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are commonly used to redirect users to malicious sites, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/wix?keyword=magic+number+puzzle+drivers+ed+answers+chapter+16 PDF link annotation
    • http://fixebojamofi.iblogger.org/behold_your_mother_catholic_answers.pdfIn PDF document text
    • http://fakts.design/trinomio_de_la_forma_ax2_bx_c_ejercicios497jl.pdfIn PDF document text
    • http://triple-doska3.club/shark_duoclean_apex_manuald7m4g.pdfIn PDF document text
    • http://kmikaerfs.ru/35063868874uf55k.pdfIn PDF document text
    • http://mainsale.info/cheat_engine_7._9_freeu8h8k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_6021f1db845bb.pdfIn PDF document text
    • http://atlas-copco.su/70989935897bzs4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fe3799208385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_5fdae17dbf424.pdfIn PDF document text
    • http://namekegosanobus.22web.org/baillie_gifford_worldwide_funds_plc_annual_report.pdfIn PDF document text
    • http://menformula.xyz/100229490569abkn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416327/normal_5fcf270a82b9b.pdfIn PDF document text
    • http://pay-order.info/adobe_kuler_free5lug6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_602568fc92bab.pdfIn PDF document text
    • http://covid-19online.site/como_fazer_assinatura_digital_em_documentou8bti.pdfIn PDF document text
    • http://dsv-trening.ru/55250545203l648m.pdfIn PDF document text
    • http://smilex.club/77817460773kqfol.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
    • http://kuzebelinebofe.epizy.com/zolufuvux.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_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 5812 bytes
SHA-256: a244bc1e56771c15ebca93f38af94449232a5d1af24abbd9de0b35227cc74eca
font_01_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 9760 bytes
SHA-256: 33b54fbe39799bb1b12ae1ad2bac225e9a48b8461e3f5c2b6249d7359a22030d
font_02_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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