Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8b2706ea2d1083…

MALICIOUS

PDF

89.3 KB Created: 2021-04-15 02:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9ab0da24bd60c0c10f485e80a05e2298 SHA-1: 93882f486c378d22af896ff89f9a2422db343444 SHA-256: bd8b2706ea2d108326a7d74c55ea70b10208503a9a5eb2583f5767f3110baf04
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, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=flowers+in+the+attic+full+movie+online+2014 PDF link annotation
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/vovijurab_tegedilexax_pakepu.pdfIn PDF document text
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/kofapafu_vepixural_xitisusi.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/674412.pdfIn PDF document text
    • https://jozisanolotodix.weebly.com/uploads/1/3/0/9/130969335/jomuxajada-finosatupume.pdfIn PDF document text
    • http://bupimobim.sportsontheweb.net/wafojirotox.pdfIn PDF document text
    • http://nemekarasika.iblogger.org/vawibalumimejarijemoduku.pdfIn PDF document text
    • http://fegekeketed.22web.org/frosty_the_snowman_pe_game.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/24ed93.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/carl_jung_collective_unconscious_example.pdfIn PDF document text
    • http://nilutafejo.mypressonline.com/all_sports_name_list.pdfIn PDF document text
    • http://xopaberowiwin.getenjoyment.net/arrastrado_por_el_mar_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzanuziti.myartsonline.com/does_medicare_b_cover_preventive_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d94b204-774b-4550-9e66-ce0c9c0a9259/mexodifanedogibudesoje.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/sosyal_bilgiler_6._snf_1._nite_test.pdfIn PDF document text
    • http://nupusadulawux.epizy.com/ccna_composite_or_icnd1_and_icnd2.pdfIn PDF document text
    • http://vedajimiti.rf.gd/naxomadegigekuguzalup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2396798b-a5e2-439f-8018-dd4bcc26e06c/dotovuwurabovuli.pdfIn PDF document text
    • http://divojeniro.epizy.com/kataxiw.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_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 5644 bytes
SHA-256: a968ea382974bf42f57977804c5490ed4aa17f00af2ef4bd0428f8b0a7a6f7b6
font_01_sfnt_off00013339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 10664 bytes
SHA-256: f4bb608682829c1d1877ae347e278aea244ec49a7dd7bdabf3119b37183dec91

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