Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9106954d26b7bc…

MALICIOUS

PDF

79.4 KB Created: 2021-03-12 15:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3461af709ec1dff9a7749b79d6ecd317 SHA-1: 07ee94a7d257afc2efa77c2f387bfdfccca0a1c8 SHA-256: da9106954d26b7bc173db348adf1ae1cda7168b73152ff1bc827510ad222a50d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/123?utm_term=chale+aana+status+video++bestwap PDF link annotation
    • https://cdn.sqhk.co/xajamenujo/fhjhija/zombie_gunship_survival_cheat_engine.pdfIn PDF document text
    • http://cabinetsly.xyz/59679420801hzsow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416796/normal_5ffb1ff7d243d.pdfIn PDF document text
    • http://rufowanojona.22web.org/which_roomba_is_best_for_pet_hair.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366655/normal_5fffa551655cc.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/50179991258l3att.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_604357a186d2a.pdfIn PDF document text
    • http://jagiliwut.22web.org/avast_antivirus_premium_apk_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_603839de9ead8.pdfIn PDF document text
    • http://fortuneocredit.com/vpn_for_pc_free_filehippo2psez.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/eibw9MM/26003356850.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/34049100074.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/f3eheij/daxakaxefov.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/csr_corporate_social_responsibility_in_india.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/the_tyrants_tomb_read_online_books_cool.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lowazuxakosilal.epizy.com/lifusegik.pdfIn PDF document text
    • http://nataruwe.epizy.com/36212625286.pdfIn PDF document text
    • http://duvodix.myartsonline.com/can_you_take_the_written_driving_test_online_in_mississippi.pdfIn PDF document text
    • http://sogirujik.rf.gd/wedaxosepevizosoxetumum.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 5148 bytes
SHA-256: 6661c6257b52b5a5cc8dc5d218992cfcffa1f41df10e84bdfcfb99bc537ec064
font_01_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 2044 bytes
SHA-256: 9812099c5b295b859b411b79c63ef0f3e15cad7fffbe3efb0a8bc6b6c1165317
font_02_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 10532 bytes
SHA-256: aa22ec4f22fe6a1948c9cf5e94ebe6822106c9f4500ff2af8c62db1ad4a24295
font_03_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16128 bytes
SHA-256: da2016d5e498be8d3e89735ec53c0e56c1ccfc88f624c0ca3c3cab136f577706

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