Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca77dd1c37e1b670…

MALICIOUS

PDF

70.7 KB Created: 2021-04-05 20:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d5aed97950112fbe42f92e961fa70aec SHA-1: 5a31763bba4a94f08bf6c7c275c35a792e72f9f3 SHA-256: ca77dd1c37e1b670e64b1ef88f6c0f511cb50fcc0f9cef0896f51efbc45e3e41
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links, likely to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/123?utm_term=pronghorn+guide+service PDF link annotation
    • https://cdn.sqhk.co/libegavezu/1SQ8k0h/bin_weevils_pets_word_search_answers.pdfIn PDF document text
    • http://badgesverified.com/38593239754y7t7s.pdfIn PDF document text
    • http://reduslim-italia.website/agribusiness_management_textbookfgapj.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/yjc27id/74220698399.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/9102263.pdfIn PDF document text
    • http://g2am2e.xyz/quran_arabic_and_english3obob.pdfIn PDF document text
    • http://ruszaimclub.ru/construct_2_turn_based_rpg_tutorialjsxou.pdfIn PDF document text
    • http://paktum.pro/canon_mf4450_ink49wxk.pdfIn PDF document text
    • https://peletawipimo.weebly.com/uploads/1/3/4/4/134444154/mibirojuvuj-larelubaguro-gemudaxawatape-jeduzi.pdfIn PDF document text
    • http://securityverifiedservices.com/rixanufekakaf6u2ih.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jjowBCW/74167478038.pdfIn PDF document text
    • http://fenellalucynelle.info/fetupuralezwj5oa.pdfIn PDF document text
    • http://logvoz.ru/eckhart_tolle_power_of_now_summary1f1u4.pdfIn PDF document text
    • http://taptopbot.com/matched_ally_condie_genrevf1s8.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/kudufigunabi/selirofu.pdfIn PDF document text
    • http://dikowipenov.epizy.com/5657403979.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/esl_free_printable_worksheets_prepositions.pdfIn PDF document text
    • http://fixadamobus.epizy.com/sogewikebudesoduzileloti.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/bullet_basya_kannada_hd_film.pdfIn PDF document text
    • http://vosobadinazo.rf.gd/why_does_orpheus_look_back.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/line_6_ux2_install_on_mac.pdfIn PDF document text
    • http://vodugesivizere.epizy.com/bukipanikosowudopi.pdfIn PDF document text
    • http://lulagewuf.rf.gd/high_thread_count_cotton_sheets_king.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/arretez_moi_lisa_gardner_gratuit.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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 5020 bytes
SHA-256: 5ba6183b39971fcdeeb2598a9cb7c51d1fef8ec09c4edf38e5879c7925df16f3
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 11360 bytes
SHA-256: b39c9aa5288a96e4766a906338953272e50b17102ac9ed036651b07f3f54a018

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