Malicious PDF — malware analysis report

Static analysis result for SHA-256 825ef71aba25b351…

MALICIOUS

PDF

75.7 KB Created: 2021-03-28 01:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 930ab6c7ae6812d140f8601963ecdce4 SHA-1: 7284a9efc0c69d638d410a1345f7d265fb14b977 SHA-256: 825ef71aba25b3517fc8c7a4ffbe350dea804cf328a340028e8b0bd24ac7db18
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. One prominent URL, 'https://ponafet.ru/award?keyword=analog+to+digital+conversion+pelgrom+pdf', suggests a phishing or scam attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=analog+to+digital+conversion+pelgrom+pdf
    • http://cosmicgig.com/futenokisaxuzonl95u.pdf
    • http://revilokepudidu.mygamesonline.org/how_can_i_prepare_for_pmp_in_30_days.pdf
    • http://discovljzg.fun/why_are_butterfly_knives_illegal_in_australia66n4q.pdf
    • http://zijaditenup.getenjoyment.net/51726147551.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_17ab7a07cf0b4c61a99a37c3c46babaf.pdf?index=true
    • https://s3.amazonaws.com/baritexovopa/airtel_digital_tv_packs.pdf
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_ef63ca5d2b174e70ac03f1756a5bea0a.pdf?index=true
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_17fcaa6cf0c34f1cb72d52bcecac249a.pdf?index=true
    • http://bujekotu.atwebpages.com/dusitamexotoxowik.pdf
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_11582d93550448d9badf35a2751a57eb.pdf?index=true
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_434f1fdd68854fef8d40d2a878f9c6f6.pdf?index=true
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_0a1b0ca0558444659123ca24b0146551.pdf?index=true
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_517e7d40e94f4ebdbd3a03a5052f3ada.pdf?index=true
    • http://wutejaxevewef.myartsonline.com/who_makes_snapper_mowers.pdf
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_c53af6f4006d494fad539ad09c7e0891.pdf?index=true
    • https://s3.amazonaws.com/buganabowumujef/invitation_maker_free_template.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_6078bf111f27464ab968fc99ed4f60fa.pdf?index=true
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_941b050332cf43a58605bb1f8cd8cab4.pdf?index=true
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_e9464a85f44f45859d8e5c9aa4ab0ccb.pdf?index=true
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_e448b13337bb4c9cb8d02f89d9e876c6.pdf?index=true
    • https://s3.amazonaws.com/fejatepudopito/amend_birth_certificate_california_form.pdf
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_4c7bdfd3bb194599ac39b5115d6e59bb.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_off0000e9c3.bin
a1cd2b4c6c866af854d350009256aa62c78bca86cedea4cd879b8949202ebd9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 5524 bytes
font_01_sfnt_off0000fc7f.bin
efae3a3341368cbe89e32a8efc7579ee62ac59db067e7e7051eee2e28178d552		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10792 bytes

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