Malicious PDF — malware analysis report

Static analysis result for SHA-256 de88ace958041038…

MALICIOUS

PDF

78.2 KB Created: 2021-03-13 23:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7c2aa6a17b993f50474d4584d8b6b358 SHA-1: 6ef850761cc44f7fbf7c1b6aa3f78faef56ec4cc SHA-256: de88ace958041038bfa552da93159440ce67fa0b05abf25a51fd89f835d58b9e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm heuristic further supports this, as the document likely aims to redirect users to malicious sites for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/123?utm_term=nba+basketball+live+streaming+apk PDF link annotation
    • http://natbeach.space/how_to_learn_the_military_alphabetbrw0i.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/TgiigwT/zanizexepa.pdfIn PDF document text
    • http://winsl.space/how_to_update_amazon_echopc3wa.pdfIn PDF document text
    • http://bu-markett.com/25294257640dg11c.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/YKhg5hd/nice_button_ups.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_6047d60f06f6e.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/aiiMngi/dixojuberuwosabeluzaxev.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/how_to_write_a_book_in_21_days.pdfIn PDF document text
    • http://petrol-v-pol-price.site/2294944255898qma.pdfIn PDF document text
    • http://smartcreditscore.info/biselulodegawipaf98q1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5ff5156cc864f.pdfIn PDF document text
    • http://construt.site/kotoparulup4x3ds.pdfIn PDF document text
    • http://otomail.business/blender_3d_download_old_versions1zcc.pdfIn PDF document text
    • http://gayerkan.com/corte_transversal_e_longitudinal4snsu.pdfIn PDF document text
    • https://cdn.sqhk.co/vakujediraw/ij1VYl7/zotipiguvekazujelugakilav.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/telecharger_pokemon_emeraude_pale9te1x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komigot.rf.gd/sopikejutiwoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a83463-eaea-43e5-85e2-6ea949dfb920/28027903793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ef3231-df72-451e-8535-93dce5763050/kenmore_gas_stove_top_burner_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c174f41a-20eb-40de-b486-4c1c5e331396/safiniruvolefugakemuwosow.pdfIn PDF document text
    • http://jusaxokipumata.rf.gd/kitchenaid_superba_microwave_light_not_working.pdfIn PDF document text
    • http://petifogowiga.epizy.com/gidemigotox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0287b9-e952-4212-8220-7ccf31f82bcb/85042971120.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_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 5372 bytes
SHA-256: 81a5336c93b2a29ed47740737791fa0014fac5159c0c4cbd86029cbaf482bc1d
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 11136 bytes
SHA-256: 18fb64fb9d77dd81043935ecb2121d72ba16fd6145d5bc20e3fc1f22e3800d1c

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