Malicious PDF — malware analysis report

Static analysis result for SHA-256 41648ec441cc3c9f…

MALICIOUS

PDF

92.4 KB Created: 2021-03-04 21:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 351fee2f230f70ab0cdab9d4aa8cf41d SHA-1: d0af1ac58f57863cb7472ee23c58adab540c2d4e SHA-256: 41648ec441cc3c9f623b15d77b5077f55d2cae44b3b01f1860aae46efc756c3a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the document's deceptive content, masquerading as a search result, point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/123?utm_term=what+are+the+three+shapes+of+molecules
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/mosej-mezusana-pafurewifimexe.pdf
    • http://italysummer.space/fazigefiresaxibote1zx7v.pdf
    • http://sq11mini.com/laxorozimodegas43xo.pdf
    • http://perevod-card2card24.site/asl_manual_alphabet_printablefaf3x.pdf
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/metiwujagaka.pdf
    • http://world-wildshop.com/academic_ielts_writing_practice0g3ms.pdf
    • http://edayafar.xyz/nadhom_asmaul_husnarxt2d.pdf
    • http://bloomwithdeanna.com/gozepixilozakepjqmfd.pdf
    • http://usesol.xyz/real_world_quadratic_equations_worksheetqejyv.pdf
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/gutogijogukuk.pdf
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/4855047.pdf
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/2c873ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jemisajoda/heaven_is_for_real_book_report.pdf
    • https://s3.amazonaws.com/wewiro/android_9_samsung_s8_split_screen.pdf
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_cacd6634703d4328b2fcb0ed6da95aec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/89403f53-47d1-48c9-a8b3-ba65730f3628/how_to_reset_samsung_to_factory_default.pdf
    • https://uploads.strikinglycdn.com/files/1c8df4e8-1e90-41e5-a7b7-0c3127adc432/programmable_logic_controller_plc_tutorial_siemens_simatic_s7-1200.pdf
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_dd577cc4756c495da6cd891573b03f04.pdf?index=true
    • https://s3.amazonaws.com/bevekizadoxuj/22323481881.pdf
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_a44dbed8bfde4f95a796b376c1613f02.pdf?index=true
    • https://s3.amazonaws.com/fosawef/kokomivibe.pdf
    • https://uploads.strikinglycdn.com/files/2809ae99-bb00-4f61-8bc2-e4edbac5e443/kung_pow_fist_of_fury_trailer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ce0.bin
161af8ef1927da631d61b1217c5b43fbaef0654631da2af16afacde74310e592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE0 5268 bytes
font_01_sfnt_off00013eaf.bin
0980034dd32480b828b59d2a1d26312f4a3a13f47d8d791bc6bb40f297efd4c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 11032 bytes

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