Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d836764280ca86c…

MALICIOUS

PDF

84.0 KB Created: 2021-04-04 21:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 638ec4a4906c67d34bdf3cd08f947371 SHA-1: d580eae2658fdbcacad364c087385175fbbdd320 SHA-256: 3d836764280ca86cf007dac9767d61a79e9a376022ec05b5652871daac180d96
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+much+is+dyson+fan+at+costco PDF link annotation
    • http://mudixefibewab.mywebcommunity.org/i_want_to_learn_arabic_language_through_english.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/giihT1b/pojavajixowevebasomapazop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501995/normal_604e04ed14285.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/jjggshb/minecraft_pocket_edition_pc_download_tlauncher.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/tovisuvab7g333.pdfIn PDF document text
    • http://life-news.tech/rakutikavoruperdxlzh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366312/normal_6005f7efbbe78.pdfIn PDF document text
    • http://kpupnov.pro/77172036223vvhsz.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/kelumowifavesusejopepiki.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/WxhgjeG/5534079476.pdfIn PDF document text
    • https://cdn.sqhk.co/lasokixon/1ifTib9/nawuz.pdfIn PDF document text
    • https://cdn.sqhk.co/naxisedomak/g5cginR/15590644024.pdfIn PDF document text
    • http://goloszauniver.fun/zomokzjcpq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470552/normal_5fcb6442292c0.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://uploads.strikinglycdn.com/files/c2f7b5a4-e21b-40c0-a9d4-033d64056cca/36803307134.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/antarctica_countries_list.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_eee4a8b630994b349eb5d05db5cee7a7.pdf?index=trueIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_eab378eef5524f1689d5430ba27652e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f628400-2df8-4b4b-9b3c-68640e877f71/how_many_pages_does_the_longest_novel_have.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_5ba6a6281bf54206b47ae78e35c82f2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7647a40c-91b8-4e5c-8ce1-3aaeafad03ff/rain_bird_controller_installation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 5052 bytes
SHA-256: 0514f8de0e29089dd4b1759dda631f9c8e23da5c1befaa104ef41ce9d4705644
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 11256 bytes
SHA-256: 610371c7acc50067740b375d22fe3467c2480b8a0b5cbeb1c495f8b2f7058029
font_02_sfnt_off0001348e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2