Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeca698129783e2…

MALICIOUS

PDF

71.3 KB Created: 2021-03-18 08:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c8a0918f60db388ed46cc7e826dc8452 SHA-1: 20601912be27d1b6a8daffd3549bd9cc550996f9 SHA-256: efeca698129783e2f57f07da0128988655a12f91fcb714473bd7026fd3ddd568
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true malicious destination by using many redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/123?utm_term=free+abc+handwriting+worksheets PDF link annotation
    • http://smartycredit.info/what_is_the_purpose_of_expository_writing_brainly0b1o2.pdfIn PDF document text
    • http://usecabinets.xyz/pozab1oz4u.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/biscuit_making_process_factory.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/duxowemojetofejavavek.pdfIn PDF document text
    • http://kawlites.online/68892655275bu3oc.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/how_to_configure_swann_dvr_for_remote_viewing.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/lezopobigeza/pixomujusumi.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_5f5973a784234761bb7f75cccbb2622f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0879a0a1-a20e-4dce-ba7f-fce2256d9573/bebujenatagogejebemo.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_4a6eeb62f80d49ada5cfb53cee8b22a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ed5a8e-6776-4668-a705-2db53bcd3d2e/poulenc_trio_for_oboe_bassoon_and_piano_program_notes.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/51846227198.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_ef89de8586234642bbe28e7a6e40cc73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/98898291080.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/afterlight_1._0._6_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb597ba7-9dfd-4cfb-a207-d554b6bf1c30/53345884548.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_50b28f427a254099a657837acab25425.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_3d58446bbe71483480117454f8b554fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/nutamemopapowafafelamuxi.pdfIn PDF document text
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_efd1ccf5da83487381ed319e51d66cf0.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 5420 bytes
SHA-256: a918290b5fbab674fd1462f69b3592871ad7cbae710e7ee4747a6e7097c495b1
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10156 bytes
SHA-256: a7e1cb3149d9b15721507b66e3195e7e86fdff63d3145fdb4638d1f8bab61357

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