Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f3f408ca42dad2…

MALICIOUS

PDF

79.3 KB Created: 2021-03-17 17:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1692d7d21e7eec38dfb0bc4545458dd8 SHA-1: 5a6fd6916fa993f3e199dd85c17b5b9f3e534bc4 SHA-256: 66f3f408ca42dad239e83f3e79ca924613d8f38a1daa2d446f490d8de900d108
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=persona+3+portable+social+link+answers PDF link annotation
    • http://metunobe.22web.org/i_spy_books_amazon.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/lekasiferisiko_rokebepuxifara_duvug_gupemegupol.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/kopirixepomif.pdfIn PDF document text
    • https://zapaviboxoxag.weebly.com/uploads/1/3/3/9/133997465/aae33b84a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokixetat/losifufebolex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07440ea7-9fc5-40dc-8790-fa4878d3171c/principles_of_electronic_materials_and_devices_3rd_edition_solutions_manual.pdfIn PDF document text
    • http://banapew.rf.gd/jilaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a36903-54a3-4fa1-b482-a484a88db6f1/how_to_draw_xy_graph_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/how_to_stop_bosch_alarm_beeping_during_power_outage.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_0cb76c9113584ae98df3ae13fa14cf42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31a0149-0255-4c44-9e3d-adb6f80bd40a/static_and_dynamic_verbs_list.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_ef333112f1f54715b91a72c014980ead.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_52b251952cd74003a24ceecdb4d201f8.pdf?index=trueIn PDF document text
    • http://dovitunazimaze.epizy.com/kimajexaf.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/saeco_vienna_plus_descaling_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb05e3ce-4894-456f-b08d-04183eb5a8b6/84870531405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1282202d-7bb5-4ee5-a6d8-9bb509834d05/is_arris_a_modem.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_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 5388 bytes
SHA-256: 4ada26d0b96b5def19f4c68db0f5300565098ecd8132a07f95b9ce0d9d1c7902
font_01_sfnt_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 10468 bytes
SHA-256: 1c12bc83aae658c42949f01d2069fa48db718b476fffff5cb9f876bc9f90d3bd

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