Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35de50fb322b7b0…

MALICIOUS

PDF

76.2 KB Created: 2021-03-30 13:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 692389a8204410b551c1921bdee9dcd2 SHA-1: 7d06bd0507fe0fcf860a90a7d2627c85ab3aad91 SHA-256: d35de50fb322b7b0004cb00ed66bb351f6998aaab4714ee11224800d4750928d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The embedded URI points to a URL that appears to be part of this link farm.

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 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.
  • 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://jacksth.ru/strik?utm_term=quadratic+function+test+with+answers PDF link annotation
    • http://kovuzaxaf.medianewsonline.com/vuxojitewubudamarizijuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_603215a33ee4f.pdfIn PDF document text
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/terivur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5feed6308810b.pdfIn PDF document text
    • https://gorejorifal.weebly.com/uploads/1/3/4/8/134888975/migaxosunegodi-temomeget.pdfIn PDF document text
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/936aeeccd18547.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/what_are_the_two_methods_of_measurement.pdfIn PDF document text
    • http://axecheat5.xyz/baffle_wall_between_transformersvtf93.pdfIn PDF document text
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/4cfcbc7b1ed19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444358/normal_5fcbb2da0b63e.pdfIn PDF document text
    • http://rowedirazizamo.22web.org/dasobaxuwokegi.pdfIn PDF document text
    • http://gayerkan.com/28126367072qelny.pdfIn PDF document text
    • http://axecheat8.xyz/29072464872i0ab3.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/7166692.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/think_like_a_freak_chapter_3_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botozagelexi.rf.gd/manual_de_bacteriologia_veterinaria.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_3a845752f5044bb88dc2beec33947336.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_706cfc4582514ab59467e698eeed3851.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_0eaecc6da5314ecab39bbf07ef5e7697.pdf?index=trueIn PDF document text
    • http://mawabubobiniz.rf.gd/92707912025.pdfIn PDF document text
    • http://tizidirek.rf.gd/latest_bollywood_movies_hd_free_2019.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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 5232 bytes
SHA-256: aa786a6682b26e661bf92fc57edf645bc5f5fb9637275c4e94005c8405a1d28b
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 11052 bytes
SHA-256: c053b60c1cacf51c18207419404ea1d0b276d219408b4e1ca9234b1ae52aa904