Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ad572911c353e0…

MALICIOUS

PDF

72.4 KB Created: 2021-06-07 20:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c501e8ce4bb7f5ba2cb7a3f6e88149a1 SHA-1: c2859309ec27d0f1da645db6ac8421bda9d85bf8 SHA-256: 71ad572911c353e006423a35db8a9149d1e5e3bd39dd39f6df6cbcd998ba4f4d
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to trick the user into downloading malware disguised as the 'Call of Duty Modern Warfare' game. The PDF structure itself also shows signs of manipulation with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=call+of+duty+modern+warfare+apk+free+download
    • https://cdn-cms.f-static.net/uploads/4488604/normal_60191a6c0f171.pdf
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ff2722d161de.pdf
    • https://cdn-cms.f-static.net/uploads/4450516/normal_6022b8b124249.pdf
    • https://cdn-cms.f-static.net/uploads/4490244/normal_603e916617bb1.pdf
    • https://cdn-cms.f-static.net/uploads/4408596/normal_60231bb03467a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25febff5-f6b4-418d-9ba9-ecc1badd2f6b/gevupawozaref.pdf
    • https://uploads.strikinglycdn.com/files/dc26cad4-32f3-4123-85e0-c618a1c4e9c0/98248763903.pdf
    • http://junerew.pbworks.com/f/will_disney_plus_have_all_the_marvel_movies.pdf
    • https://uploads.strikinglycdn.com/files/b5d46baa-ebf7-41c1-8b3d-cbe93b407a43/50_shades_of_grey_download.pdf
    • https://uploads.strikinglycdn.com/files/0a4c42c2-3738-4788-8e09-bbe54501d8f1/gituzubedizer.pdf
    • https://uploads.strikinglycdn.com/files/a1ff8e57-8d8d-46fd-b98b-0f98cc43f839/guided_sleep_meditation_youtube_short.pdf
    • https://uploads.strikinglycdn.com/files/a31eb8e1-0e7b-4284-b9ae-852e28f6b557/how_to_write_science_fiction_and_fantasy.pdf
    • https://uploads.strikinglycdn.com/files/8334c9a1-d82c-4737-b44e-3f42299e3257/why_is_nigeria_an_important_country_in_africa.pdf
    • https://uploads.strikinglycdn.com/files/208210e8-f409-4e06-b5c3-f9787c3791cb/what_is_an_activation_function_in_neural_networks.pdf
    • https://uploads.strikinglycdn.com/files/b9390feb-cb39-42cf-ad7c-dd7c98ee6e68/how_to_clean_a_kenmore_high_efficiency_washing_machine.pdf
    • https://uploads.strikinglycdn.com/files/6f3013bf-6dbb-404d-8aa4-42dd58637d14/how_to_change_fuel_lines_on_poulan_wild_thing_chainsaw.pdf
    • https://uploads.strikinglycdn.com/files/fa5b0b31-295f-4b93-9ffa-281d099a6072/fm_21-76_us_army_survival_manual.pdf
    • https://uploads.strikinglycdn.com/files/1e42aba4-8580-42ad-b562-8de568e08e78/control_systems_engineering_google_books.pdf
    • https://uploads.strikinglycdn.com/files/5df821f4-63a8-4b99-bd25-6aabe3833507/burozufatuxuwujoris.pdf
    • https://uploads.strikinglycdn.com/files/238920e1-0a16-48e9-896d-9626aa091a8f/fukemofasofudesisoba.pdf
    • http://pilujibos.pbworks.com/w/file/fetch/144500739/2165133247.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd00.bin
1643306f57f3cb7a1432403979cd6b738682357e25c5aa643df0450d8d1ac1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 5172 bytes
font_01_sfnt_off0000ee9d.bin
9f95ac79fed11fc4264b793a87bf3c87b89bf480df0d8634ced863d898d2ba8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 10456 bytes

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