Malicious PDF — malware analysis report

Static analysis result for SHA-256 901ef28e9e65325d…

MALICIOUS

PDF

84.2 KB Created: 2021-03-09 05:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee9b3250ea74cbd289517361f0f49f76 SHA-1: 574691ed2f99ef5ea3fdfdd9bb62f16562ce2d3b SHA-256: 901ef28e9e65325d9cc6ace930c1b413cd2d797458c8ab2a4a6171f9c3fe6289
126 Risk Score

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://baarspo.ru/wix?keyword=minecraft+build+theme+list PDF link annotation
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/livelejari.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/5508442.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/iV9ieBr/what_the_fight_unblocked.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/model_3_vs_model_s_interior_space.pdfIn PDF document text
    • https://cdn.sqhk.co/fejumoraw/1wvZ5ii/avatar_maker_cute_cat.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/somewhere_over_the_rainbow_flute_sheet_music_beginner.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/50439640017.pdfIn PDF document text
    • https://koneligave.weebly.com/uploads/1/3/4/5/134581264/542624.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/how_to_reset_pelonis_space_heater.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/mefovu/gcf_lcm_word_problems_worksheet_with_answers.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_2940eea159d94e22b4133c1ad0731ba4.pdf?index=trueIn PDF document text
    • http://mobukug.myartsonline.com/36570035144.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/surefikel.pdfIn PDF document text
    • http://jeximojela.myartsonline.com/1141230936.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/weposijugifujefo.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_7c99649d77e74dcbb861301d926a393a.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_0cbd012a4b494e20a8a5c2b07b0cbf3c.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_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 5408 bytes
SHA-256: 8a510c52f90373ed335d2cd272d8741de67822cecf333dbe7e05a8b29a220203
font_01_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 10392 bytes
SHA-256: 3db85bc6a37b52ec0c966a8ed0bd5cdb5ce2dd079e077d7ab9eb35283f18b599

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