Malicious PDF — malware analysis report

Static analysis result for SHA-256 11390d7b0dcae226…

MALICIOUS

PDF

75.6 KB Created: 2021-03-15 02:19:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c32dd82b64a7dc4b99473bbfc555284e SHA-1: d6df1a9ab002f7025ec1f573bbae4d9e07000b02 SHA-256: 11390d7b0dcae226e0290a638d35a495d659542e2ed8c8d777857b938415706e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many of which point to other PDF documents. The document body is heavily obfuscated, but the presence of a URL related to a game guide suggests a lure to attract users. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=gudaguda+rerun+guide+gamepress
    • http://lomigakorak.getenjoyment.net/powermatic_2_electric_cigarette_injector_machine_for_sale.pdf
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/5287969.pdf
    • http://vasakuso.sportsontheweb.net/digital_design_subs_reviews.pdf
    • http://dalifajebuxog.scienceontheweb.net/95370477143.pdf
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/pojobogowutizi-mapitipavu.pdf
    • https://rigefenasoje.weebly.com/uploads/1/3/0/7/130776330/kewam.pdf
    • http://tafuxasomup.getenjoyment.net/eleanor_and_park_summary_no_spoilers.pdf
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/pibijovat.pdf
    • http://logawedulukudan.mywebcommunity.org/resistance_band_exercises_for_chest_and_shoulders.pdf
    • https://dipilewojariwu.weebly.com/uploads/1/3/2/8/132814651/valumod.pdf
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/ziwiwow_musesovetaj_xulanebebavubip.pdf
    • http://vozuzutiwajuzip.getenjoyment.net/4325770646.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_b9475486d673403bb1ee3d3f1b410022.pdf?index=true
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_01607a3265f449618d2586f788f85249.pdf?index=true
    • http://dopovis.myartsonline.com/organizational_structure_definition.pdf
    • http://vebusatoro.atwebpages.com/que_es_el_taller_artesanal.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_130d01a164484c97b57d4dfee2f9e3be.pdf?index=true
    • 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_off0000eaff.bin
8715eb90b235ea49d26779ca8a9b72823b00ebcc1d3b1c7ec77bcb9b99482cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 5276 bytes
font_01_sfnt_off0000fcdd.bin
51a683ec3217f33ad47152aff89e9cdeb43b33031eef6782822798651fae6f09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 10764 bytes

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