Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbc2c3e4641b5ce…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 07:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7895617ebc741cdcf3af1af3bad7c576 SHA-1: 55b96000b180249f2303731051b8d43d3f7bdf35 SHA-256: 4cbc2c3e4641b5cec6e00da42bb8140ac67db5ce4697e9410be6f2a720f1ea42
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://druttle.ru/wix?keyword=sparco+car+seat+f5000k', likely lead to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://druttle.ru/wix?keyword=sparco+car+seat+f5000k PDF link annotation
    • http://moscow-siberian-force.online/history_of_philosophy_ac_grayling_review0bl85.pdfIn PDF document text
    • http://smartbright.club/3d_visiting_card_design_psd_free852rr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_60182dc00ec2e.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/cvhdhDr/horizontal_stretch_and_shrink.pdfIn PDF document text
    • http://istlan.fun/63337686501mskyr.pdfIn PDF document text
    • http://bigops.fun/4191185951212p79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fe0dfe0f0082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500183/normal_5fe791561d504.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/hejeBie/nokomiro.pdfIn PDF document text
    • http://delayikapy.xyz/41811032423pfbig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_d46a51b62f304189992da79cb56a6861.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxegeza/novos_jogos_de_dragon_ball_z_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/menhaden_capital_plc_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/20472659320.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_b0c0c00267c94fc58a54b69b0f237857.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_fc9ed9e2695c446d86a7351e88643eb1.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_b7c9c97fce89497d99f459f691b53eed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/67989828575.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/miluwoluwoz.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_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 5408 bytes
SHA-256: 4f3c603b0ea0930ed4402469f3afe48fce5d95cedbf605dd52523d0b4b53de52
font_01_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 10796 bytes
SHA-256: a908e4879018c2cb2121a3ae9b582a6e707f95703a9b09f112247bcb0f1e4306

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