Malicious PDF — malware analysis report

Static analysis result for SHA-256 430d57abc8ce80db…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 04:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 29b82212c5332de4cc4ad622a12d247a SHA-1: 59413dfa6a0f5cffe8a0bffe73b42da397c76ca1 SHA-256: 430d57abc8ce80db19f9a2db0f19f23347ebdb5f1a4ee121f29b64909d3dd861
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://maypoin.ru/123?utm_term=network+diagram+template+excel+free PDF link annotation
    • https://cdn.sqhk.co/miseseren/hgxieb8/nekuzotivuvotejufa.pdfIn PDF document text
    • http://julaximufe.66ghz.com/maths_quantitative_aptitude_formulas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_6058d3dbb4bdc.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidatoxo/geCig0c/grocery_palo_alto.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/hfgfIhh/guardians_of_the_galaxy_ringtone_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_605449554a5dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5fe0135f94e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_60265a205c940.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/1606e13d-549d-4977-957e-ba23efcad130/can_sex_cause_spotting_in_early_pregnancy.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_33636516079f4925b59fbfcfefcabf97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e828b6d-4038-44ea-a5f6-6cebb84f97c5/queen_of_shadows_book_cover.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_ff458b2be317451e9d3fbb307135da15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1bc153-f18f-4797-90eb-5ceae3465725/relation_and_function_quizzes.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_018478d8d1404721944fadfded01ed16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6fcaed-62f1-4756-bc6d-985901767f1e/85980292734.pdfIn PDF document text
    • http://rajuleneto.epizy.com/machine_learning_algorithms_cheat_sheet.pdfIn PDF document text
    • http://temekerujaniva.rf.gd/ziluxuxedigalaxobelakir.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_f60d9e541d344704b734cd4d6dd0c6cf.pdf?index=trueIn PDF document text
    • http://zevizajezu.epizy.com/4232391228.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_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5492 bytes
SHA-256: 3a2efff919f4a091a7ef5049dd869049944fbac784e18c3b7002a950d3177b86
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10952 bytes
SHA-256: d947f350da296d1497a964c7f844e020568ec36d9d86a58464330496950d1b66

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