Malicious PDF — malware analysis report

Static analysis result for SHA-256 966a74cff392a5ce…

MALICIOUS

PDF

81.0 KB Created: 2021-04-02 02:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ac856dace633949f578563cbafecd961 SHA-1: 5354b6955a201c380d2116cd9daa9974f9854e3b SHA-256: 966a74cff392a5cecd14c332c124620b854920406ff6b8e1c21fdeb93646eb8b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/award?keyword=pdf+in+word+umwandeln+mac+os+x PDF link annotation
    • http://itasda.online/mrs_dalloway_portugus_download_gratisawip3.pdfIn PDF document text
    • http://copyright-services-us.com/6902296360yk2r2.pdfIn PDF document text
    • http://petersikdar.com/is_alkaline_food_bad_for_your4ltc.pdfIn PDF document text
    • http://trynutra.shop/how_to_reset_consumer_cellular_phonehwvdz.pdfIn PDF document text
    • http://zarabotok.space/waxojarogdc44.pdfIn PDF document text
    • http://trend-sales.fun/94446655534qqwak.pdfIn PDF document text
    • http://inglassrus.ru/nautilus_nt-cc1_smith_machine_with_cable_crossover_for_sale5nwuo.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/3164229.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/7e29ee5.pdfIn PDF document text
    • http://twobigs.space/thinking_out_loud_chords02lie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/miledu/96662472811.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_c90982df6f9f4c248e495ea5fe2ba9df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/bootstrap_material_design_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/pelus.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_ae07198abc074e44ab268b8969efd710.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_d98c43feaf10409eb8ecad1dc823aa2b.pdf?index=trueIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_b9e24da9e6cd473cba1ca6bba74b1c60.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_9a3c1450a5a24d71ae191a98bb748847.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_e8e9fdf946ff434b8f2c381405a7e2b0.pdf?index=trueIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_79393dd3f3844356aef0aaec5c35fca9.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_4ff6fb1add384a8f921b3e8e69d1c54f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowibatev/54495621753.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 5132 bytes
SHA-256: a1a8f80d398f20027198d7512fa68f52135cad795cf10e505649922e58f2a757
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 13016 bytes
SHA-256: 5b7dddb036d8d57cc6b49d30c699708475bf37ed5232fc0addaa205008a60568
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176