Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a6b056d6bf8149…

MALICIOUS

PDF

92.5 KB Created: 2021-03-20 07:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 415f8d424fbc491282bc6f07f39be999 SHA-1: 5e88ec115f421cd88b093e9dd8b4159c551bcd28 SHA-256: 18a6b056d6bf8149a1604aa91fc2abd100f5719d7e03a8800ac5520055e12f58
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://baarspo.ru/wix?keyword=0+8%252A0+6 PDF link annotation
    • https://cdn.sqhk.co/lilaxikixo/ghaxjff/the_buzzer_russian_radio_station.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/7902237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_5fea40fa3a19d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_5fd961e530d43.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/e1365d9f0.pdfIn PDF document text
    • https://kepubaxolawava.weebly.com/uploads/1/3/4/7/134703856/3249588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_6011d4cfa512b.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/iH9pEkE/sky_convention_center_events_2019.pdfIn PDF document text
    • http://luxshop21.site/85967643221c15ax.pdfIn PDF document text
    • http://usesucre.pro/195082170954r5z3.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/b00e03b8a8e84f.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/fhghgjd/chameleon_master_run_color_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/1PAjfL3/shudder_day_meaning_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5fd7c9e495b86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_5ff3b170a5f5d.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://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_8550bd5171af4e80868731f856952562.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_a7845487c696488fad13982e2a4cac6c.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_bc1493b15d0b43f499e7ecf8443e71ae.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a3bec39690ff4b8fa0134412f2895ed6.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_b57c8edaa3fa45a9b414fc7f07f5d167.pdf?index=trueIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_036f82c3fe614a5bb9ecd327cc9d27c1.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_f4e008293ae547bc8344f4a088448b9b.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_a6536a4056a0453880a330161d0b3d87.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_72f990e1d87c4a79b017c4ff30f88f22.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 3952 bytes
SHA-256: a1f27ae56add7a50617d5933e96f0b2cece8bb46ba9ea2b63d4d1632196750be
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 26424 bytes
SHA-256: d6e250e6249e1f38d8af7538e1e17a3a9e0d6b1dc84f7622f6215aaac8b62f54
font_02_sfnt_off00013f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F33 16404 bytes
SHA-256: ee284f987dc5234dd4e9f0b463016a1bd5917a0076b26920b57b34dd7ecec4b3
font_03_sfnt_off0001550e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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