Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f8b1fccbbb423f…

MALICIOUS

PDF

78.2 KB Created: 2021-02-09 06:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d231cd6e06bf9981d95750bb9f172ba0 SHA-1: d481ef62d3c58e8f04ad61111ee8c98554a04145 SHA-256: 69f8b1fccbbb423f3fa37e25009d38b8e3344c31fcad418e82223c2c679c70df
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a large link farm pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=zoho+imap+settings+iphone PDF link annotation
    • http://fallofelin.online/e_okul_snf_kitapl_oluturma_programxff52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376869/normal_5ff5afbe1711b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402486/normal_5fc7e6ca018f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390069/normal_5fce8b51d062d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5ff91a1cd4a4b.pdfIn PDF document text
    • http://ubzvp.com/cost_accounting_16th_edition_pearson_custom_business_resourcesfenhc.pdfIn PDF document text
    • http://pusokum.66ghz.com/express_in_rectangular_form_calculator.pdfIn PDF document text
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/tudemigonajam_sekav_gipurolabuxix.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/425d3bac1ad75.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/javezipesiv_sevivitik.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/ijvH7hf/monster_truck_fever_driving_experience.pdfIn PDF document text
    • https://gonibulurigudum.weebly.com/uploads/1/3/0/8/130874364/ef55bb7dce15fed.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/girl_guides_canada_sparks_uniform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5fd3b8875c465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_6002b81ad21ce.pdfIn PDF document text
    • http://kieverts.xyz/maparutujaxuvopejusixa6z3s3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tumofif.rf.gd/34812929466.pdfIn PDF document text
    • http://nezopodadas.epizy.com/56681007508.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_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 5064 bytes
SHA-256: 0db66116988b29a21ed51e2e39e81261aa91e84e088c28b5026cb92c39cd5358
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 10872 bytes
SHA-256: 7ed452103f95884bd8860eaf328c36c68e7e232868113ed6cda82ea0f5508e61

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