Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff895e508ffece43…

MALICIOUS

PDF

81.5 KB Created: 2021-04-08 16:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fa14feed5bba11ddfa441a84db94cb2f SHA-1: 91e2761b025b820ae0988bc43ab9b8dcb2b6b201 SHA-256: ff895e508ffece4340f2f6e204a711d800dc6da332a30e7f55786904dee57307
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=molecules+of+emotion+audiobook+free+download PDF link annotation
    • https://cdn.sqhk.co/jarebomu/gfgdvjj/rojimupazuti.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/jf5Ljj9/st_catharines_school_uniforms.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448550/normal_5fd04dc00b863.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/htijYig/81605032844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6015d5a1a3384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_604f13e8c4cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_602cdc76426ce.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/7DThfWF/wonigog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_60461c00b7da5.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/cR4Gias/evil_snowman_names.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/bpIr3jd/ultraviewer_min_ph_mi_nht.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/gcD7icZ/11921636689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_64667495634e4bc3adc1a8a673f45e28.pdf?index=trueIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_c0edf419dea54f7a8b8feec96d0df01a.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_864ca368f1c4441d8e3c7c22900f4db6.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_d2fab4966c224e7980b85a1c07c6c477.pdf?index=trueIn PDF document text
    • http://xepalufozakot.epizy.com/icasa_regulations.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_4473fdb0595f4ec79d0479d9a95adab4.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_34a5151ba24b4a7dbc77588d06cec3c2.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_34abd6642c5147b5865c4336e660c0ff.pdf?index=trueIn PDF document text
    • http://xilekur.epizy.com/sudurorenevufuxadolisaf.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_c3584772a3e8447aabe741a006e103a1.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_91e5e6bc685c495b97a471fa22f1690e.pdf?index=trueIn PDF document text
    • http://wefebasutij.epizy.com/acurite_02016_color_weather_station_with_forecast_temperature_humidity.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_8905726c74f140dc80a13b9045c50b71.pdf?index=trueIn PDF document text
    • http://fevanazenanow.rf.gd/39123232554.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_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 5468 bytes
SHA-256: db8eea3344ee42d7a36fc3b87d81d1810213e51f76e4179388df6ffd9d4bb815
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 11684 bytes
SHA-256: 6c315a5795b9b719fdafe17e9329dbcb26c559fcecea96670b2920becbbf9d34