Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d352da6c798d35…

MALICIOUS

PDF

86.1 KB Created: 2021-03-10 02:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dcdc63ef35587d09076de27e429c53f3 SHA-1: 978ba4ae0bf98b8254fdda6b66fd08fe7dc7765f SHA-256: 66d352da6c798d35c45c1094faab2ded2cb3c1fa0b3f482b98fb2092de17f119
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/123?utm_term=epileptiform+discharges+on+eeg PDF link annotation
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/solituwusi.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/the_entertainer_tab_songsterr.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/zazanemusukoxajakalabuveb.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/egdiehi/54882643804.pdfIn PDF document text
    • https://tovunebutulewe.weebly.com/uploads/1/3/1/8/131871744/vojusutimurafezukufa.pdfIn PDF document text
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/1956371.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/how_to_write_critical_reading_response.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/how_to_drain_lochinvar_water_heater.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/gdnTTsr/buddy_toss_hack_ios_download.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/microsoft_office_2013_free_download_for_windows_10_64_bit_with_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://solarujarinobo.myartsonline.com/nlt_bible_app_for_android_apk.pdfIn PDF document text
    • https://29ea0a04-1cbe-476d-a5cf-12744288e5e9.filesusr.com/ugd/c8683e_4035a0424c00484fb03ab068b2d6dc59.pdf?index=trueIn PDF document text
    • http://nisuzadusidu.epizy.com/washington_state_escapement_reports.pdfIn PDF document text
    • http://widagutevutedik.epizy.com/gre_word_list_with_roots.pdfIn PDF document text
    • http://pejefovad.epizy.com/barista_apron_template.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_0a0fba03d587403c8c270cc70963844f.pdf?index=trueIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_1e8acf303d694eadac2e686825c78fa4.pdf?index=trueIn PDF document text
    • http://nerezusilanake.atwebpages.com/gazuvadejurosowegapi.pdfIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_86c9f69ff47b4140861ff06a7480111b.pdf?index=trueIn PDF document text
    • http://wufikemofumop.atwebpages.com/werizu.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_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 5312 bytes
SHA-256: 11853f27b2f35e050d02d19ddbc6d7d50719da0e78c221209ce16a40b3f5810a
font_01_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 11196 bytes
SHA-256: a256b85e7a1e45b371db5959eb5cd590c73bf5ede850ac50888ab0c438185b91
font_02_sfnt_off00013aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c