Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dc0852214e7a79…

MALICIOUS

PDF

83.6 KB Created: 2021-03-12 07:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a1777f702fba0cd281e18b50059c820 SHA-1: 92057996ead4e028b4fdd4c1f30c735a09c9f9ec SHA-256: e3dc0852214e7a790cc7b28938cc71c6f781b187a37dfddb4387a6bdfa112dc7
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=kahoot+answer+hack+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5ff3ee47952ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_6032b7cc1f9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6032a2cc51e8b.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/6883269.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/tedibare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411246/normal_5fced0d3a5806.pdfIn PDF document text
    • https://xutifapob.weebly.com/uploads/1/3/2/7/132712150/65f5b9fca.pdfIn PDF document text
    • https://xajapeni.weebly.com/uploads/1/3/4/3/134341300/jizoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_6017b57ad0ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5fdc85da41935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_600f12a4d55bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd242bdec9a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6020d11a936c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3898d1bc-b540-4010-b0f6-94b3f688cb05/how_do_i_set_the_time_on_my_g_shock_5522.pdfIn PDF document text
    • http://bokonejedebi.rf.gd/4959832627.pdfIn PDF document text
    • http://katudajug.epizy.com/menigodito.pdfIn PDF document text
    • http://giwatev.rf.gd/87534417865.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/tfs_bdd_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790caf8d-fef2-40d8-b112-95404fb71fd3/how_to_grade_your_language_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/10978703566.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/cursive_alphabets_a_to_z_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/best_fishing_pole_for_fresh_and_saltwater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a309115-357a-4993-8344-6a34cdde7e03/commercial_cool_portable_air_conditioner_10000_btu_manual.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_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 5116 bytes
SHA-256: a23e831894e4ba22e57f1a1e2706e5f4fb41058fd747436043a969ae40608729
font_01_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10812 bytes
SHA-256: b12a085d91d95703bfbe47831ae014c454e77c6e5b8f9c6b8b8a2b62ae54a6aa

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