Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ed21840385b780…

MALICIOUS

PDF

73.7 KB Created: 2021-04-02 15:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bcda615297cac3b7aad9368b667b630 SHA-1: 8fedb20008d8bc115ef312a7cba23dbdf028aa93 SHA-256: b4ed21840385b780d75322c17ca2b9041c3b1c717a1428e5df968c4d01e54946
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 payload. The PDF contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme to drive traffic to malicious sites. The primary malicious URL identified is https://botokaw.ru/wix?keyword=skeletal+system+diagram+pdf, which is likely used to redirect users to 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://botokaw.ru/wix?keyword=skeletal+system+diagram+pdf
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/7682583.pdf
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/4479995.pdf
    • https://cdn-cms.f-static.net/uploads/4486997/normal_603df5eb1d63a.pdf
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/3533457.pdf
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/6111940.pdf
    • https://cdn-cms.f-static.net/uploads/4409801/normal_602e243f91296.pdf
    • https://cdn-cms.f-static.net/uploads/4481163/normal_60570d7f88b57.pdf
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/5759626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_d6d21a717de0441f930d2656b547a0cd.pdf?index=true
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_3af9fc511aec4cde8bc89f8cc2362410.pdf?index=true
    • https://s3.amazonaws.com/dowavelaxam/revojob.pdf
    • https://uploads.strikinglycdn.com/files/68346cb2-d965-439f-8abf-91f1b7cbdb42/which_animals_has_the_highest_population.pdf
    • https://uploads.strikinglycdn.com/files/f4c2cbe8-5cc2-45f4-839b-20900903fd6b/how_to_charge_an_everstart_maxx.pdf
    • https://s3.amazonaws.com/saziwijaxodav/kagawurufumubex.pdf
    • https://s3.amazonaws.com/vapite/football_manager_2016_best_players_to_buy.pdf
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_6cb28d0697544aa592c8f500c038f4ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/487e50af-b88f-481e-8622-8774269fdf06/towixopidukumufipaxixe.pdf
    • https://uploads.strikinglycdn.com/files/ffa1fc25-477c-460b-8055-cca429f2a1c8/pegegux.pdf
    • https://uploads.strikinglycdn.com/files/da9f94db-a78c-4061-92da-74cedc3756ea/xezalozegilajanapeb.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_off0000e20c.bin
24af1a1c934e86ac8b546f312bf938c4de3ea88c8b67bf304671aba573494430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 5628 bytes
font_01_sfnt_off0000f525.bin
bdb662e59445ff20dcbe73449550d3bccc9c18678162754e770cc063f0f32b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 10276 bytes

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