Malicious PDF — malware analysis report

Static analysis result for SHA-256 47da9ae6ce0bf00a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 15:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7e7dffac86002f2d98d8ecc56b5c70fb SHA-1: d6e9f7342ad71b97e9db93114c7bbb0c6dfd030c SHA-256: 47da9ae6ce0bf00a13f49d30c5426c49e2c063e9bc32458da1e86ed2b5539496
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware delivery. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/wix?keyword=quadratic+equations+standard+form+to+vertex+form+worksheet PDF link annotation
    • http://prizinsta24.space/sonic_adventure_dx_metal_sonic_storysudv3.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/object_oriented_programming_in_c_with_examples.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/isometric_exercises.pdfIn PDF document text
    • http://clobuss.ru/california_association_of_realtors_rental_agreementcv9pd.pdfIn PDF document text
    • http://peuer.xyz/elements_of_music_3rd_editionuvb7c.pdfIn PDF document text
    • http://findfreegirl.com/autocad_3d_basic_exercisesuiqmm.pdfIn PDF document text
    • http://alsamcctv.com/normal_distribution_formula_in_tableau443ds.pdfIn PDF document text
    • http://lurubalopare.sportsontheweb.net/network_marketing_ebooks.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/bionic_turtle_notes.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/remington_700_308_magpul_hunter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_e508225c4d6a4ae0809c6cf051c01b60.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_f8ab6d3b7f3f49f3957f5f25bff466da.pdf?index=trueIn PDF document text
    • http://sekuwomexapa.myartsonline.com/acrylonitrile_butadiene_styrene_properties.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_4905c27495ed47fb917ae11e65c96e86.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/rilobawiwebifezokugupo.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/american_sniper_2016_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/37374549051.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_594cae31eb8e4df5a460699b0f3915cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/fiddler_on_the_roof_characters_and_descriptions.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_b53e9b592c384edba37eb03c75c183f4.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/neil_gaiman_books_list.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_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 5700 bytes
SHA-256: 917d21c46e11611f715b046d3307ca5da7fadd96b43c4192773246bba3002a79
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10568 bytes
SHA-256: 693279fabc7ec7f798ef8533a1f4694fa1e9988ab1947c572cda271d314315d5

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