Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bb370d92cb0354…

MALICIOUS

PDF

68.4 KB Created: 2021-03-29 20:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b4e55f842983c108c917360038c96510 SHA-1: 1c547f384a7348e456b311413dcf2a4999b495d6 SHA-256: c7bb370d92cb0354f106ed761f11c5c005ef15acd74070a6df45c9fe28bb2188
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 0.9997

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://seumenha.ru/strik?utm_term=tears+in+heaven+easy+chords+no+capo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492892/normal_603af2adbdf49.pdfIn PDF document text
    • http://azorocheat5.xyz/agar._io_online_crazy_gamesuv5vy.pdfIn PDF document text
    • http://instapodarok365.site/73172337426o4b8s.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/gigrhg2/slack_download_ubuntu_terminal.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/xL4Vif1/maxijifik.pdfIn PDF document text
    • http://uplrezina.site/android_studio_run_button_disabledflxb6.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/gidghih/zosuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418762/normal_5fc851a23cca9.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/jLpZiid/fruit_splash_match_3_3_in_a_row.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5ff97936c4079.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/kibigWF/tinuxakitamenadalufipam.pdfIn PDF document text
    • http://helen-art.ru/81879783658sox64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_5fe36387c4a48.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/f485b9ce-94eb-4107-b67d-dc523de37c31/how_many_calories_in_a_large_iced_coffee_with_skim_milk_from_dunkin_donuts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5519d6-ca7f-4344-a401-23cab5032109/basic_jazz_drum_patterns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7a6938-178c-49aa-a61d-9132be4d22bd/hamilton_beach_breakfast_sandwich_maker_with_timer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b792830-2457-4193-8108-38d849d8dc55/devapawabubilaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfd2b89-5a60-4d26-b45c-3015b9faabfa/sugar_blues_thin_lizzy_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba13da79-7ec8-4161-8327-0f5c05c70703/what_do_democratic_socialist_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e53644-1cfa-4bdd-ba03-04f9081437c0/french-english_dictionary_book.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_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 5240 bytes
SHA-256: b0bf465c378a3f1c0715ce875be4e08171eb5c6e2563151b51590ac45464c2da
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 10596 bytes
SHA-256: edc8c4fd917f3dd3ac78dccf3a6af034efbe0dfe6b66dc7d77270b0e77883797

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