Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff07f43ac7d59d39…

MALICIOUS

PDF

107.7 KB Created: 2021-05-12 05:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7bd3d6d12791ac73dd0883d18822666 SHA-1: d835f94ae2c607f8e3dd106e68b83d6b57cbb6dc SHA-256: ff07f43ac7d59d391d37dfd7122da15e905bb5468c8137d86380412f023be7c0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a suspicious domain, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=rimas+y+leyendas+gustavo+adolfo+becquer+sinopsis
    • https://cdn-cms.f-static.net/uploads/4482023/normal_60538f38447c2.pdf
    • https://tefegori.weebly.com/uploads/1/3/1/6/131637168/disukab-mupiditufuxu-zuvatufuvovij.pdf
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/6281315.pdf
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6067989016c89.pdf
    • https://cdn-cms.f-static.net/uploads/4425912/normal_60461ebf86116.pdf
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/d778f6f83a1e.pdf
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/vasuzoke_guzabadana_kofusirirumav_nabog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_25ba1be8972244f09bc9332f4c9e4357.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f2281418-9d2e-4900-af2b-3a7b3f5210b9/52319893931.pdf
    • https://s3.amazonaws.com/zaxuledo/anchor_hero_guide_empires_and_puzzles.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_e64a7476aaa84864afc387b491f13eac.pdf?index=true
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_513185b322ce44c78211e1b9b67bf0b5.pdf?index=true
    • https://s3.amazonaws.com/dogazisuze/6189636577.pdf
    • https://s3.amazonaws.com/kabisebax/2007_hyundai_sonata_service_schedule.pdf
    • https://uploads.strikinglycdn.com/files/f37ef50f-19d6-4a67-90cf-5c55276e0a9e/86210421502.pdf
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_b4f3b131829d41179aa196079e349176.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_4ae0144ce2714ca5a379d6d0ee7cf6e4.pdf?index=true
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_f840e3af002f4f959399b5182e0f3c7d.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_0c29259dea414156b2f806b29bec55e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7448d06f-79f4-4a24-b681-c8fae22390df/science_a_closer_look_grade_4_workbook.pdf
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_f8d166bee50c4dd1bdf61c912c25f299.pdf?index=true
    • https://s3.amazonaws.com/ganubifirigevi/bed_sheets_and_comforter_set_queen.pdf
    • https://s3.amazonaws.com/litunux/tvs_barcode_printer_9650_plus_driver.pdf
    • https://uploads.strikinglycdn.com/files/97e64298-882d-4fce-b1f5-23300da72d17/how_long_to_microwave_a_sweet_potato_in_plastic_wrap.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_off000161c5.bin
d0a462ee600e3079d67e7df7b16f8f2920d7b324b807397c2b16e80f45bf4a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161C5 5912 bytes
font_01_sfnt_off000175d6.bin
f0706fdd51487e375682bfc8f592f9c80769ae37078289df7b105a6d6f3bb6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175D6 12884 bytes

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