Malicious PDF — malware analysis report

Static analysis result for SHA-256 7553ec0d95523eaa…

MALICIOUS

PDF

74.5 KB Created: 2021-01-17 12:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 75dc8e59de483c7398ad3711b8bd4c16 SHA-1: 951bbe2e5f1b3afa4a4e2672a92834bebc9ce29e SHA-256: 7553ec0d95523eaaf49183a0d368e2dad33fb12aa6ca91d5539b9d4ae281d807
184 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 links, many pointing to disposable domains and redirector services, indicating a link farm designed to obscure the final malicious destination. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=jumbled+sentences+exercise+with+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fe9a65775db1.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/haSVgje/nobabefan.pdfIn PDF document text
    • https://site-1188839.mozfiles.com/files/1188839/current_carrying_capacity_of_wire_awg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fa118673d42f.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/dHvMCgi/75422287110.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/0ojeSUO/jiwetubuzenawajebut.pdfIn PDF document text
    • https://site-1179105.mozfiles.com/files/1179105/pafujifi.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/hhifibD/84375579399.pdfIn PDF document text
    • https://site-1229106.mozfiles.com/files/1229106/fractions_worksheet_grade_1_printable.pdfIn PDF document text
    • https://site-1171689.mozfiles.com/files/1171689/jurassic_world_alive_hack_mod_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_5fdf1c0199152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f944f515fb34.pdfIn PDF document text
    • https://site-1168112.mozfiles.com/files/1168112/what_do_baby_crows_eat_and_drink.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pidufozu/real_estate_brochure_design_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/sql_server_blob_storage_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/free_google_adsense_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/52690405774.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/arnold_chiari_malformation_type_1_surgery.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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 5684 bytes
SHA-256: c3f8ccd1d18b7a9c602a7cba1e0969f1e783847c2ba780b02e2fad13d73d4b19
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10520 bytes
SHA-256: 7bdf2fc111fb664636369984230d69266daf04d13d3f602432a7ee9323c759d5

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