Malicious PDF — malware analysis report

Static analysis result for SHA-256 c341351521805f11…

MALICIOUS

PDF

75.2 KB Created: 2021-04-04 16:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94d8807fe8e4d477e068142e74f06b7d SHA-1: 98fe55946cd0d1023db5b85d69454a91c41998b0 SHA-256: c341351521805f11a975ba31b6e0e15de690f56bc65756b8e3316507f042a0d2
184 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://yafferge.ru/wix?keyword=imperialism+in+china+webquest+answers In PDF document text
    • http://vatetuda.scienceontheweb.net/igorot_tribe.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/67847225844.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/autismo_en_nios.pdfIn PDF document text
    • http://zoo-taxi.site/30694405754cdgyp.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/gdbhbhj/64262578532.pdfIn PDF document text
    • http://zuzavepojul.mygamesonline.org/93465266133.pdfIn PDF document text
    • http://usesoda.pro/how_to_install_t_mobile_cellspotq10oc.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/euripides_medea_summary.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/algebra_2_systems_of_equations_and_inequalities_test.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/hgidiiI/59552095668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_6065aaccdc6b6.pdfIn PDF document text
    • http://gsmall.space/the_lippincott_manual_of_nursing_practice_2nd_edition8g3aq.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/kFggVjb/napomotumapuwuzedog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fd7ad169cc2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_601425959d6d7.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/hj4SXij/dyslipidemia_guidelines_2018_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/haiijcJ/96881112172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6052fd8480705.pdfIn PDF document text
    • http://axecheat9.xyz/vajivabupelonazu518kw.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
    • http://tojuzogip.myartsonline.com/pdf_file_converter_download_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/apertura_piriforme_maxilar.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/workout_tracker_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/weiser_smartcode_10_forgot_master_code.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/divine_intimacy.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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 5240 bytes
SHA-256: 3f73402224f88b393ef5bc0acbd818dd97980c57c4f9a0c6ebc84dba50ac09a9
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 11104 bytes
SHA-256: 615ffea1301a3525232e38715fa204c2cec84b52ed325e5d7ffb0433428ba0df
font_02_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71