Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc849987c07ae0ed…

MALICIOUS

PDF

74.6 KB Created: 2021-03-14 09:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c069de165139b5616c361388ef83ea64 SHA-1: f54e62ec8cea3d5d13860066a263d51919919c56 SHA-256: fc849987c07ae0ed9f52e361180e36aaca44b9067a480e491619c094fa14eebd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of external links and the heuristic findings suggest this document is part of a campaign to redirect users to malicious content.

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://nipisod.ru/123?utm_term=html+link+to+pdf+converter PDF link annotation
    • https://cdn.sqhk.co/woluzadeviv/j9vAlMn/tuzotuvovezisosesijutamin.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/gfDBOvY/palapimizugak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fcef4325065c.pdfIn PDF document text
    • https://sajijudid.weebly.com/uploads/1/3/5/3/135393685/xidiz-rovalixe-bufagokejogux-fojuboru.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/jKZTxgw/kingdom_adventurers_copper_coin_farm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fd079b56fd99.pdfIn PDF document text
    • https://paripipedaninez.weebly.com/uploads/1/3/4/4/134444050/9735315.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/94b7442045.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/xunaxa.pdfIn PDF document text
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/0440ef8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fc95649083af.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/metekes_pomodunonenep.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/xajarodi-rowisoxiw-vujelidazisak.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/djiW8if/dark_forest_green_color_rgb.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/8478955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megelugik/37055968007.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/secret_garden_restaurant_cat_ba.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/in_s4_find_a_cyclic_subgroup_of_order_4.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/split_green_peas_nutritional_information.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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 4996 bytes
SHA-256: 89404d6100055bd07ab79c4320600bb3545eca7d1878ee27de6eaca497a6ff93
font_01_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 12624 bytes
SHA-256: 823e0a7bec8f121462c2e78cd71cd250cb4d5bcccfdd48b1bae4f383c61d8f01

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