Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbbdc7bd29bbd59…

MALICIOUS

PDF

94.5 KB Created: 2021-03-16 20:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1a6119b852f35ae989dad3aa1885f466 SHA-1: 19e405f6ac9f7089e6e9aa3c02329dc07022bc5e SHA-256: 7dbbdc7bd29bbd5955efa1938eca7990f986e958c4a59e06d0a1c3cc85762edf
126 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 high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to `https://pelibifir.ru/wix?keyword=use+of+octal+number+system+in+computer`, suggesting it functions as a lure to a phishing or malware distribution site. The presence of many links on disposable hosting further supports a link farm or spamming operation.

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://pelibifir.ru/wix?keyword=use+of+octal+number+system+in+computer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425917/normal_601a9dad59928.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/high-probability_trading_setups_a_chartists_guide_to_real-time_trading.pdfIn PDF document text
    • http://manovina.mypressonline.com/protocol_helicopter_remote_control.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375884/normal_5feb58c123cf3.pdfIn PDF document text
    • http://filfex.ru/samsung_mu7000_specsarx7b.pdfIn PDF document text
    • http://shothard.site/43448668054uthzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5ff905c9c4540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6027cb0a29048.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/43273863328.pdfIn PDF document text
    • http://mailedflkf.site/mobagavilodaxodeynd7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fd67bf923155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_601cddb203379.pdfIn PDF document text
    • http://tuzupibu.scienceontheweb.net/60307489759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_600ca203de949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_044d408588b942a68a13b2c46ebf9ace.pdf?index=trueIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_0a482d1d6d0f4b1eb760533ddebdbc4b.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_3d3636cd5ac44e41a04025a46bc4a6ab.pdf?index=trueIn PDF document text
    • http://davinawoguzag.atwebpages.com/star_wars_ffg_unlimited_power.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_3801b1d5031642809cf8d2d5a6389eb5.pdf?index=trueIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/fish_biryani_recipe_in_malayalam.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_off00012ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECC 5396 bytes
SHA-256: 625aef320817b198814f5126843fe1a16086710079426a6b2df7d26a0820d168
font_01_sfnt_off0001411c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411C 13104 bytes
SHA-256: ecd33f15057ebbd38e97118e2bb6308eab50db34a8668e1c998e450f66152424

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