Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09bfba4d843eaea…

MALICIOUS

PDF

67.7 KB Created: 2021-03-28 07:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: acbf30c9cf67de1f6fa10638a3e8d371 SHA-1: ee48fda948d761920f1f023be217a8a067c8bdcb SHA-256: f09bfba4d843eaea68abe7f956320c4e971dd5244a528daeff3fcf811d2f55d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://seumenha.ru/wix?keyword=chapter+6+equations+and+inequalities+answers PDF link annotation
    • https://cdn.sqhk.co/josedinis/hfjjBic/download_the_tribez_build_a_village_mod_apk.pdfIn PDF document text
    • http://taygerr.com/english_etymology_dictionary_free_downloade2wab.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/how_to_use_a_bissell_powersteamer_powerbrushmu0pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/5ieGrW7/automatic_data_processing_inc_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/iijhjgn/getabenavatorasajaxep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_60059d9a6349c.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hhhWJdW/78785916356.pdfIn PDF document text
    • http://hangookoil.ru/zefokuborisikatanuvenetebr3n65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5fd28a9e980b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_e8a0daf31e774640bc64f3a8f7a36999.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_41001065efba4c22a5192a10a341184d.pdf?index=trueIn PDF document text
    • http://resisimokopi.epizy.com/sheetrock_joint_compound_for_bathroom.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_d05773f9dc65436bafe8722ef22bd67b.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_30f200603bd64450a62124245c4ba993.pdf?index=trueIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_768b758fdfd0426388e0e3b6ce3c17ca.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_9d3efd44ba0640dead4f9af9c2c9eee9.pdf?index=trueIn PDF document text
    • http://gotuziput.epizy.com/labels_template_avery.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_c2aeec8e54b9451e96ac0a986722ec9c.pdf?index=trueIn 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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 5324 bytes
SHA-256: 434406a1c6f5e7390052ec3918104c388f538071d9edb54a5274ea66f640003c
font_01_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 10728 bytes
SHA-256: c3766f875041bb13802d64ad825d4c6a03300963ff30b51c0e9cb46c8bbabce5

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