Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15e9ed8c1bc79f…

MALICIOUS

PDF

72.1 KB Created: 2021-03-21 10:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81765f10ad8e72362b4b82e27604a752 SHA-1: c799a2c11df817b5fce44a89e4cb5c6b80c8fee1 SHA-256: dd15e9ed8c1bc79f1ba63abcad84f206e134c5466d8f07bdbdab22a4d13ed672
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 0.9990

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/123?utm_term=caballo+de+troya+10+pdf+descargar In PDF document text
    • https://zefokivovemajo.weebly.com/uploads/1/3/0/8/130874141/197793.pdfIn PDF document text
    • https://cdn.sqhk.co/papedajapej/kvXiiif/alchemy_lab_empires_and_puzzles_levels.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/fur_elise_piano_sheet_music_for_beginners.pdfIn PDF document text
    • https://vokuduvalabi.weebly.com/uploads/1/3/4/5/134502282/d7cc1be.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/Gihkv6D/heroism_pathfinder_2e.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/rrfheja/passive_voice_simple_past.pdfIn PDF document text
    • http://pusokum.66ghz.com/gloria_victis_archer_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxogafu/Pvjhijh/64094972410.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/4798891188.pdfIn PDF document text
    • http://vopibuxipem.22web.org/a6_flyer_template_photoshop.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/vawopopoxe.pdfIn PDF document text
    • http://nepesesi.22web.org/historia_de_las_banderas_de_mexico.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/danogaxavinasonotaguten.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/b0dhdye/loopy_looper_results.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/32102229197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bafemiw.epizy.com/arquitectura_moderna_desde_1900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726585b7-bbcc-4485-a857-09876b15e691/pebuzetujulozejob.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/63460977103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e039718a-670c-4563-8291-f3cb2ced3fa8/how_to_reset_samsung_tablet_t580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769942d7-7b15-4da3-a79e-67d647815b61/gta_v_codes_pc_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0459b0a8-849f-430d-9fcc-07f605f1b97c/428529361.pdfIn PDF document text
    • http://lewarojutuveg.rf.gd/warhammer_fantasy_factions_map.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/o_positive_blood_group_diet.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/84317713865.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/speakeasy_bar_and_grill_bar_rescue.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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 5664 bytes
SHA-256: e60e7dad4c2d5d86808b0db00e7f4ce337c6a9bfd0d3fe72ab2a1407f0a753f6
font_01_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 11936 bytes
SHA-256: 23d266b32c097c557ce4cd031ae5845c80b23fcd51c7850127b185d10ddf0398