Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adf48a6c673a8c6…

MALICIOUS

PDF

75.8 KB Created: 2021-05-15 02:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 332f75f3e1dc028532de20d491d0d5e2 SHA-1: 1061d80746dee986eef8e7144cf71a2aa511626c SHA-256: 4adf48a6c673a8c67f6ca5b65af60063a437c6cb75d86dcebe2cd71c8e3ab10c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://golowaki.ru/strik?utm_term=best+yoga+for+constipation+and+piles PDF link annotation
    • http://vvinorama.fun/browning_a5_serial_number_starts_with_xf8s17.pdfIn PDF document text
    • http://dsv-trening.ru/color_change_photoshopd00ms.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/2d_battle_simulator_modm092f.pdfIn PDF document text
    • http://rujitexoxobag.mypressonline.com/63785047507.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/keNjcgg/79150738034.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/egjii5N/800_words_season_4_start_date_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/heShjUO/catfish_recipes_asian.pdfIn PDF document text
    • http://gogotmif.space/how_to_set_the_time_on_sony_icf-c1thyfah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5e26e9-8e68-48c5-a76c-08fc6074f571/bowflex_xtreme_2_se_assembly_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff69b06-1d8c-40ab-9408-c223f494df82/vumel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7f173b-fb61-48ca-8f25-56315a963d2a/xogofatejurab.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/list_the_5_relationships_of_confucian.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/short_vowel_sounds_worksheets_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/how_to_diagnosis_ectopic_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b7a3c3-2543-4289-81f8-62a31b99dbb7/lozojawewagamazukika.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/xubutazalisozub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac08a15-84e7-4a09-824b-4cea59966950/links_awakening_turtle_rock_missing_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bc5e24-f88e-43ff-a112-f0ca4b837f43/how_do_you_find_angles_in_a_kite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e236b856-458a-40b0-b778-76fcd3b3025c/53415766237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778d0383-9918-4c8b-bde3-670f4fc168e9/what_are_all_common_abbreviations_for_measurements_in_cooking.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/company_letter_headed_paper_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/31890563196.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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 5476 bytes
SHA-256: f7b276a6d27d1399c98566300c0896573d17405d2232397e36cfaf3482c5c189
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 10076 bytes
SHA-256: 82a2d990760ea9c98db2c04e96caae4142430fdc23d985d453cdf42bff684cc8

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