Malicious PDF — malware analysis report

Static analysis result for SHA-256 d075b68c9cb8b3c8…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 06:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f45d35c0771bd3ef3629aa49d34fc9ee SHA-1: eac457b903a5bfb19ac164c9b3ad1e94d5f0dda0 SHA-256: d075b68c9cb8b3c8db14e86491b861108c9e4b365331db4a3a60284eef9eb529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a mass of external links, identified as a 'PDF_SEO_LINK_FARM', with one prominent URL being https://midufefew.ru/strik. This suggests the document's primary purpose is to redirect users to potentially malicious or spam-related websites, likely as part of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=conectores+en+castellano+para+redacciones PDF link annotation
    • https://cdn.sqhk.co/volotedi/cggheS3/thoroughly_modern_millie_song_julie_andrews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_602cff327bf10.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/iPihxGC/zusuribopupiwoxitupakajo.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/ZgijTid/today_s_date_in_excel_power_query.pdfIn PDF document text
    • https://cdn.sqhk.co/jarutejip/Fibhh6w/zexewuzojilodararemo.pdfIn PDF document text
    • https://cdn.sqhk.co/letabuner/hh5gjRG/free_strategic_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/hckkwHF/65106020274.pdfIn PDF document text
    • https://cdn.sqhk.co/givujelised/iejaEjw/nusabazum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5ff65ffc9f826.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/YMgihTi/38564409639.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/iUKHH95/4_function_calculator_bulk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5ff026fd44b54.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/jbuIihf/desejerezo.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/c8yhj9P/puxin.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/tghWjhI/the_forest_crafting_guide_download.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/hjbMajg/wire_size_calculator_dc_current.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_5fd7cd87d894b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6028111aae8a4.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/Djghhjd/ditoxewaronuginef.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/8ha1idi/55798673837.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/zjhRZih/mit_application_essays.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_ecea647b2f56490e8e2be1f7e0a4c23d.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_c9316543e54b4d8db4b6fc0b7753acae.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
stream_003_off00010608.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10608 11168 bytes
SHA-256: 9052cf5c0aecafcd4cbd92b1dc88c1c99d2077f8d6c4d547966a35fb407a6495
font_00_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 4972 bytes
SHA-256: cb5950671ac24460fcb14baf76d6cdb368fe108cbd72d461965f586b13b4d4d6

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