Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80e4d187a3dfacd…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 19:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9135bd8e56241184e2c456e7e06879b0 SHA-1: 10dd947e85c98744478f85b6901f7d16f6d768aa SHA-256: e80e4d187a3dfacd7ed7ab14b17b9843f679e28bc10ead125bd448de36d3aafe
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true malicious intent by distributing links across many low-reputation domains. No scripts were extracted, but the PDF structure and external links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kuzutuzo.ru/strik?utm_term=possessive+adjectives+multiple+choice+test+pdf PDF link annotation
    • http://jawixogu.mygamesonline.org/nuwonorekojut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fe7ca8783281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fe56bdc0e297.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/what_to_do_when_water_heater_pilot_light_goes_out.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fc84b9458dc5.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/how_to_pair_altec_lansing_jacket_h20.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/starbucks_mocha_frappuccino_calories_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5fcbacf1b302e.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/the_stranger_camus_book_review.pdfIn PDF document text
    • http://juzirafotiwiwa.iblogger.org/yard_machine_riding_mower_ratings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fe526d088e7a.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/how_much_does_a_nutritionist_make_a_year_in_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_4a6865dc72574481b3197d84bb9e0892.pdf?index=trueIn PDF document text
    • http://vaxilokenifak.epizy.com/12787428597.pdfIn PDF document text
    • http://sobunase.epizy.com/65779066870.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/how_to_do_master_cleanse_diet.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_719797a1465c496bba6c5b8b318311dd.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_f5a60c3753924bb4b5022194849c9173.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4afca3f-8a77-4aac-99b5-6abcb1cca113/facebook.com_help_delete_my_account.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_7c9848a2fccf407c98f957f0f5bd15bc.pdf?index=trueIn PDF document text
    • http://kosener.epizy.com/42048192570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff10a24-3883-48b0-ab8b-72748c329618/edipo_rey_y_antigona_libro_completo.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_d1a0c722e9e24db3b014241a06cfe614.pdf?index=trueIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/wofuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84f2bcb-d126-4e00-9f92-29d22320d34c/sex_education_season_1_episode_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 2872 bytes
SHA-256: 4b7484b0b944f736520f77e3c24c7f2a9e02750bf2f1c8d37da4dfa4d98a86e7
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 5436 bytes
SHA-256: c1f56f022dc406af2cb8af9ba71f95865533060ea710a8b23428a8218ebd8651
font_02_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 10652 bytes
SHA-256: 26614ab711b8f90c49d000e69897a35cb4c2c7d01324ae066bd59e3984ed1c36

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