Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bef38013697fc4a…

MALICIOUS

PDF

81.3 KB Created: 2021-04-29 01:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 96f5b4b419bcd2eede5e3e7b155896e1 SHA-1: c04a669f63fad4c3b6c00c22f8cfd97295955a8e SHA-256: 9bef38013697fc4acdcc4def89d8be1eb4cc9a82ceecf44256c8a05657eba669
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=figurative+language+worksheets+2nd+grade PDF link annotation
    • http://gepavozo.mygamesonline.org/85485465801.pdfIn PDF document text
    • https://denafeferigo.weebly.com/uploads/1/3/0/8/130874231/538b9c11c.pdfIn PDF document text
    • http://naguvogegexaze.22web.org/evirinin_abc_si.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/how_to_put_on_a_cvs_blood_pressure_cuff.pdfIn PDF document text
    • http://danifewikusi.scienceontheweb.net/16214215814.pdfIn PDF document text
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/xasemufusi-kokolepinis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375342/normal_5fe187ba50a1b.pdfIn PDF document text
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/4134127.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/sumumifevijupeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456728/normal_603220bd6501b.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/toefl_reading_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/knife_river_mn_fishing_report.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_38254665afdb4fb69a1a279a59a16fab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/21672846792.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/ideal_protein_phase_3_guidelines.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_70323f0c01e64241aedebdbea8bda503.pdf?index=trueIn PDF document text
    • http://dexutosujusu.epizy.com/opportunities_beginner_student_s_book.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_2085f460614f4d88a1f39739766e424d.pdf?index=trueIn PDF document text
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_c9f1c466db344911b4b47432def2292e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 5388 bytes
SHA-256: 42e2184ef19d148c3d1618e4be06057b1ad9737090eaf6416c7c5f72bc5355cc
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 12180 bytes
SHA-256: ddfbad8bd2648ca95e06dbf260e112dfba308df9df3f465014c2daa249c53e58

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