Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da64cfe8b2eb32f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 05:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 197157fd7cb84a1e2f4624d38626fee1 SHA-1: d0cd91e075c126a4cdb4a74bde3738ebeb6c66f3 SHA-256: 8da64cfe8b2eb32fdef1c513e79bdeb04e8c21311cbc097316ed9d629af9fd69
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The 'Fake CAPTCHA' heuristic indicates a social engineering tactic to trick users into interacting with the document. While no scripts were directly extracted, the presence of numerous external URLs and the ML classification strongly suggest the document is a malicious phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://jottigo.ru/123?utm_term=minecraft+lycanites+mobs+equipment+forge+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481068/normal_5fe982fa0d2ba.pdfIn PDF document text
    • https://cdn.sqhk.co/xawemubimaj/etgiQD7/birobosonuj.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/idfihea/49254147937.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/hiifVhj/vekuxixeb.pdfIn PDF document text
    • https://cdn.sqhk.co/sovebiba/ehdGUgi/40727477295.pdfIn PDF document text
    • https://cdn.sqhk.co/fejukomus/kggzibw/2092604636.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/g9CFCNk/32820350999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379219/normal_5fefcb8ba0349.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489241/normal_5ff4983704bc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_daa9479467a7453c9d680ac4315c7679.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_7b217dffda7b40de8b5e6fefdd14c1b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e498a68b-49c3-4b6e-af31-5ff6674ba4f6/how_to_become_a_criminal_justice_attorney.pdfIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_7b799f9144c646e59e3a8e4777577572.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/black_screen_video.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_99177356d7c94461bdb781edd15007bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f43de94-02af-45c7-ab28-71d2c1496f18/how_much_pressure_in_presto_pressure_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/mofewudup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0caac9-3fe2-4042-b57a-d53d4f81368b/57825888139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206a57c6-1c63-44d0-8b93-8f0bf6ce028d/cara_setting_cisco_wrt120n.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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 5848 bytes
SHA-256: f86dfb8ffe62eb54461d093d3bc3f52a2b4337772a74412efcbdb38fd1a96f71
font_01_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 11684 bytes
SHA-256: 6d6bdf4bd4f4de26992939ae1645ee452c0d38d42350c89c2f7146e4a18174fb