Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9856bd67113263…

MALICIOUS

PDF

77.8 KB Created: 2021-06-06 12:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e3e10c214f90e59cf5f61c315ae60f22 SHA-1: 93dc5ee0dbf28486fa6fb7756df1d7611b7d7bbf SHA-256: 6c9856bd67113263150ecc502a4c593f29e268973b78a53cb71b4ee17a3fa096
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

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
  • 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://archism.ru/pbw?utm_term=descargar+super+smash+bros+64+espa%25C3%25B1ol+para+android+sin+emulador PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4460473/normal_60b2fcee89eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_605e10faab444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_603c48c2e1e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_6026391153b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_5fd79ea029b7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fcbfabdd7de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fd0e2a96e9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_604635d2b08f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/193c4d70-eb03-4185-9f36-18a6f7a5ac93/55798926591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e08e5f-f820-4ee5-8c88-be90fbe59047/cursos_de_ingles_gratis_online_lingualia.pdfIn PDF document text
    • http://gatunam.pbworks.com/w/file/fetch/144529344/algebra_1_practice_9_4_worksheet_answers.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/w/file/fetch/144487689/jolly_phonics_readers_level_1.pdfIn PDF document text
    • http://nagaxop.pbworks.com/w/file/fetch/144538527/nokia_800_tough_dual_sim_manual.pdfIn PDF document text
    • http://seromazu.pbworks.com/w/file/fetch/144679278/reported_speech_indirect_questions_exercises.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144451599/sadie_adler_rdr2_online_location.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144566205/xujosatixepuwejawuxu.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144535848/25192434065.pdfIn PDF document text
    • http://garewewaziwu.pbworks.com/f/rupuwupivodulafusukad.pdfIn PDF document text
    • http://fawitugeva.pbworks.com/f/89250307870.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/eysenck_personality_inventory_epi.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144720429/one_direction_four_deluxe_album_download_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577c1083-7b62-4e49-ade4-ff8877e33084/79734586610.pdfIn PDF document text
    • http://lumoxag.pbworks.com/f/what_is_the_cost_to_hang_drywall_per_sheet.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/w/file/fetch/144552291/advanced_business_communication_skills.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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 2880 bytes
SHA-256: aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344
font_01_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 6080 bytes
SHA-256: c7e886a1b90b56332dec954388674c89129f0ac9080741cbec44d892f8e68d46
font_02_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 11164 bytes
SHA-256: f9f3e3db45059459cfae1dd43e5c015a632724579a096e3db1e9dd81e08fc33c