Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfd248fbf3daa54…

MALICIOUS

PDF

75.8 KB Created: 2021-03-30 17:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 926d9e307ea7388edc625ce40fa55e58 SHA-1: db36e5f191b1c1c38aa0a7608938adb18c029ca2 SHA-256: 8bfd248fbf3daa54fa63970256fdd253fcd549fe7922c4d173b3ad0f2a54fd9d
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, including one pointing to `https://ponafet.ru/wix?keyword=atomic+structure+worksheet+answers+key+quizlet`, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful sites. The authoring application `wkhtmltopdf 0.12.5` is also noted as an IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=atomic+structure+worksheet+answers+key+quizlet PDF link annotation
    • https://cdn.sqhk.co/pozedezupase/cXYehee/79805080985.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/ge8hjao/real_boxing_2_apk_hack.pdfIn PDF document text
    • http://pressit.space/268068510298cy2z.pdfIn PDF document text
    • http://fastdonwload.space/do_washers_have_a_reset_button7fkh3.pdfIn PDF document text
    • http://creditstar-kabinet.com/various_prayers_lord_be_the_center_of_my_life_lyricscv8q9.pdfIn PDF document text
    • http://iciapp.xyz/92913569797yfcai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_c744f2a6baae4266aaeede5e0bdab549.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nojemi/sisozofanelifudakozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3080d6-0c61-4624-90a2-8f10109be5ee/the_unbearable_lightness_of_being_movie_watch_online_free.pdfIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_0a9a309f948245c38c067cc142254eea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58bc002c-063d-4862-99c7-6fe094751fff/docker_cookbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/celebrate_recovery_step_study_book_4.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/insert_sheets_in_excel_vba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04fc732-f00e-484a-81ec-6b87bde4ccff/9103030033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16d0128-be17-4fb0-b01c-c8675ede9992/1314686000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb1c0b0-c7ca-43ec-98c0-5906ef8dcbfe/56612829459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c8de78-ccc1-416b-9872-0d1a18d2caf3/which_tube_has_the_highest_lipase_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/zakosoxafuxapagi.pdfIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_9fb2143b9f9c4efdbed0beb1512b323d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa77acc-11e4-4c8f-b84a-275fbcf6c78f/xipuragelukivewe.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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 5464 bytes
SHA-256: cf6c6db080a234d5e96df426098610dffba45566abb28c575a229161bdd038c8
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 10692 bytes
SHA-256: f062e551a1d599cc90e5e8181cba2c9275a476aebb691395978a1a7b2efda4cc

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