Malicious PDF — malware analysis report

Static analysis result for SHA-256 e105ba21ed24a25a…

MALICIOUS

PDF

79.7 KB Created: 2021-04-04 08:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 92cb1e4b0f82e81dfc51697bd25c4aa0 SHA-1: d455c1840965a3b84459427a5070e43b2837c579 SHA-256: e105ba21ed24a25a2a87e3e866d9435faf20ee18f162ff1191b0b0ecd1731f05
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=cell+biology+powerpoint+free PDF link annotation
    • http://leree4.club/sumiwepemupomotuo4r6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_604dd8a6a72b6.pdfIn PDF document text
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/tadizisewo.pdfIn PDF document text
    • http://ipatovaalena.ru/radibafuxutizu5ddzf.pdfIn PDF document text
    • http://spencermcman.us/870895832756zony.pdfIn PDF document text
    • http://rinobozawizuvew.iblogger.org/electrode_potential_of_metals.pdfIn PDF document text
    • http://pubgmobiie.com/bojojudazadupedepewa34r.pdfIn PDF document text
    • https://fewifaki.weebly.com/uploads/1/3/4/5/134578400/4973be1fb7d2f47.pdfIn PDF document text
    • http://tipografiyav.moscow/angna_padharo_maharani_original_songc7k1f.pdfIn PDF document text
    • http://telemprom.xyz/solving_logarithmic_inequalities_worksheet21dxw.pdfIn PDF document text
    • https://lezezirurebox.weebly.com/uploads/1/3/5/9/135967023/jiwaved-fuvolobigajapoj.pdfIn PDF document text
    • http://pink-echo.club/java_spring_resttemplate_thread_safen1drx.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/fdba5200adb3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_601424f4ea829.pdfIn PDF document text
    • http://xtrading.buzz/rurijupenefulipo3yanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_8544c0a50d9b428da1681409b2f12042.pdf?index=trueIn PDF document text
    • http://ritofeli.epizy.com/barcode_generator_ean_13.pdfIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_abd4e512fc114c599eaf7b4f665f01fe.pdf?index=trueIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_4e6ae96ffdd54f5b9fa64e01da7d0247.pdf?index=trueIn 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_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 4828 bytes
SHA-256: 3a8dbddc125f858cf6bad5c631fd319ea52531170d96bc5a9f3a77a7dd0111db
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10556 bytes
SHA-256: 77e5c3a98e7c57dadf4117dd61cd5520c5ab9b7a6c48caeeeea09253a4018341
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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