Malicious PDF — malware analysis report

Static analysis result for SHA-256 7335e9bba4c4c60b…

MALICIOUS

PDF

73.3 KB Created: 2021-06-06 16:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a45db33f930fe43c6569fc4abee9c86f SHA-1: 0a3af35292e1466b2343d0a6d49fb137715c14fc SHA-256: 7335e9bba4c4c60be2b88d048fbf7e77fccbd9f384f8d6e4071cb2ddc279612a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic to direct users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://huntic.ru/pbw?utm_term=ejercicios+uso+de+mayusculas+5+primaria
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fe3a3439ca30.pdf
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5feff6484cae0.pdf
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6023346bd4e39.pdf
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5fc649e1098bc.pdf
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fd674d1a6f64.pdf
    • https://dajifavetesa.weebly.com/uploads/1/3/4/2/134234726/3a0be70ac030b.pdf
    • https://static.s123-cdn-static.com/uploads/4477379/normal_5fdfa90a8c61c.pdf
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6024ac12c216c.pdf
    • https://cdn-cms.f-static.net/uploads/4465000/normal_6012097fa5955.pdf
    • https://cdn-cms.f-static.net/uploads/4370288/normal_60baf58183473.pdf
    • https://cdn-cms.f-static.net/uploads/4379961/normal_6011c808794eb.pdf
    • https://jirumovovajunu.weebly.com/uploads/1/3/4/8/134899481/aabe2b54.pdf
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5fd32df9f205c.pdf
    • https://sarodinejafa.weebly.com/uploads/1/3/4/7/134762654/dujomulutirosu_lidipim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xifilipisi.pbworks.com/f/erie_metal_roofs_pilot_program_reviews.pdf
    • http://jizakatum.pbworks.com/f/the_artists_handbook_of_materials_and_techniques_ralph_mayer.pdf
    • https://uploads.strikinglycdn.com/files/a1a8153b-1ef7-42c5-b0b9-39bc70d5f8e1/can_dyson_air_purifier_filters_be_washed.pdf
    • https://uploads.strikinglycdn.com/files/c88a1bfc-4f26-4aa0-b777-c30552be4fdf/sazegotiwefo.pdf
    • http://fadoposapat.pbworks.com/w/file/fetch/144576579/planeacion_didactica_del_14_de_febrero_para_preescolar.pdf
    • http://vafobotigef.pbworks.com/f/vegelunibetavozipusi.pdf
    • https://uploads.strikinglycdn.com/files/5da1e459-7273-4736-82f4-853ec1df8fb1/what_does_incapacitation.pdf
    • https://uploads.strikinglycdn.com/files/1948086a-a2c0-4cb1-85cf-4b0df096cfb9/48654603712.pdf
    • https://uploads.strikinglycdn.com/files/c623f781-2710-4da1-ae79-822f80edcb1f/how_to_reset_a_pool_pump.pdf
    • http://fuxedemama.pbworks.com/f/pcos_indian_diet_plan_to_get_pregnant_in_hindi.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_off0000de56.bin
e992c58be100826e58c813500f30a393bf5f394dde40329e604af20fdafae44c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 5476 bytes
font_01_sfnt_off0000f0f3.bin
b5dff741326352dc2ad7a58b5a47e2becc9737f6752ef469cc1f8a670ab70991		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 11292 bytes

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