Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbb024af29e29a3…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 12:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6367064e7e61affa7d4debb5091f14ef SHA-1: f38677180ed44b9f47ca06d3adf70db6df8b03b5 SHA-256: 5bbb024af29e29a3eb2fde8a9961b25cb0209b954187fd23608630157ce0e42d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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 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
  • 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://jacksth.ru/award?keyword=awareness+of+hiv+and+aids+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498348/normal_600f5dbcae151.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/h8iaidD/cross_linking_surgery_pain.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5ffaec9680c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_6018029208908.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/how_to_reset_the_code_on_a_bunker_hill_safe.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/fhegggg/71575401034.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/92083361604.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/fhhU9As/mk11_aftermath_skins_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/ghcjgjf/greek_word_for_master_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/ibgcgeC/simple_present_literary_definition.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/cosco_scenera_next_dlx_vs_next.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/90843584840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/59427ae6-5464-4c02-af86-8d16367569b9/what_does_c_reactive_protein_test_show.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/gikuwexepefivef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f61d62-72ec-4477-9fa6-4a96172ee9ec/what_do_the_symbols_on_my_danby_dehumidifier_mean.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_64d8fd3485054e25908885237185da22.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_eb9a0256f2b74cb1ab22a4ab98f8d6c5.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_a18e738975aa4cc3830e493d2d5e8ab3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ed8331-c283-4bd1-a1be-c5003a67ad77/74046910965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7d9725-aaa4-46bd-9490-7eee64207588/medios_de_comunicacin_interna_en_una_empresa.pdfIn 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_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 5236 bytes
SHA-256: dcc252d3de13f42a75f2cacf3cb96eec93e43cb6fb632e17a164762cf3d4a623
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10616 bytes
SHA-256: 1ea6ab8a3e33b52752b779e69f0bc8050ea3bca33dbd31e89de13a8f45fa9bf3

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