Malicious PDF — malware analysis report

Static analysis result for SHA-256 af26314d941d7125…

MALICIOUS

PDF

71.5 KB Created: 2021-03-24 14:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a693d770d1977124bcbc555704896b4 SHA-1: 8937ffc9157bee2a1bacbc689752df118bc21f50 SHA-256: af26314d941d71255a8ae462e85b33132923ec9b059981a9cb7eba580fd54827
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. The primary attack pattern involves luring the user to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://yafferge.ru/strik?utm_term=using+information+technology+11e+pdf In PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/eIhhUhi/rofabigasexi.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/dfja9jj/10799811451.pdfIn PDF document text
    • http://citruss.space/42462241749gjage.pdfIn PDF document text
    • http://experiment.website/47168159248u083j.pdfIn PDF document text
    • http://xavolavuduxi.22web.org/ho_chi_minh_city_map.pdfIn PDF document text
    • http://tufokazavet.iblogger.org/65437995602.pdfIn PDF document text
    • http://natnat.fun/troy-bilt_tb575ec_parts_diagramirlhv.pdfIn PDF document text
    • http://dibozakik.22web.org/pdf_to_word_converter_for_macbook_pro.pdfIn PDF document text
    • http://leree6.club/world_war_2_arena_crossword_cluetjy5v.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/jIghwhb/fishing_break_mod_apk_4._8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/mviewcM/80657337946.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/norton_anthology_of_english_literature_9th_edition_volume_a.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/YZjcx7K/bidaded.pdfIn PDF document text
    • http://topuxuwuvalam.iblogger.org/word_formation_exercises_beginner.pdfIn PDF document text
    • http://pubgmobiie.com/195930677119qrd2.pdfIn PDF document text
    • http://fetoxuk.mywebcommunity.org/cdr_to_converter_software.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/tevomenil/harmonica_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/9371759923.pdfIn PDF document text
    • http://zegapoja.epizy.com/62847894946.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/65152706385.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_8339d01901d34f11b62310cc6012bd4e.pdf?index=trueIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/bsc4success_july_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/love_dare_challenge_day_17.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_60dc9b454f674505bcc8edb58b09ad1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/spring_boot_test_rest_controller_resttemplate.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_6b4c9ffffc62446b8253056636ac66eb.pdf?index=trueIn 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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 5712 bytes
SHA-256: ae645e1349c32b8b76e23470d90bd711d53d9e57db6f1362284076553f3e3759
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 10836 bytes
SHA-256: 6e82888c506a81d4f28d298ca569294c401786feacb6193992d07bad1a2124e2