Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d57dc6e7f1cf832…

MALICIOUS

PDF

82.3 KB Created: 2021-04-13 09:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5217ef4ed24deb765c413c3af1dd9d7b SHA-1: 79034695e1e6271eea7b417d009df3a46e562179 SHA-256: 4d57dc6e7f1cf832f6da1b84eff80005145aa26975ea1195cc095acf723e5f44
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, which is likely the primary payload delivery mechanism. The document body, though heavily obfuscated, appears to contain keywords related to product replacement, suggesting a lure to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=carrier+weathermaker+8000+blower+motor+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455645/normal_606e9843c7235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_606539d800051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_6064aee99af4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_600d3f2d4951b.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/jaiidgg/basic_english_grammar_books_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/ihhhiaE/mikijinekarokufonena.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/the2ja4/copper_coin_price_per_ounce.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/gljhhhc/vr_space_shuttle_simulator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420939/normal_604890b5186df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473954/normal_5fed12fca91c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469374/normal_5ffd6d0e97e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/biakdhi/dakulufazuwugas.pdfIn PDF document text
    • http://burolona.22web.org/noxaxuxizurovem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lulelepese/what_is_the_theme_of_allegory_in_the_masque_of_the_red_death.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/post_civil_war_reconstruction_period.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/ixigo_flight_booking_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/zisepidulumenunetew.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/curing_of_concrete_ppt_report.pdfIn PDF document text
    • http://midexudotag.epizy.com/negajunitaligeza.pdfIn PDF document text
    • http://kirawolus.rf.gd/castellated_beam.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/q2._explain_the_recent_trends_in_production_and_operations_management.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/josutowopukav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 5532 bytes
SHA-256: 6d8cef86f45e7d03301c69c057a11e79f2e3df31b5510536becc53174c29db6f
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 11456 bytes
SHA-256: 279b8369886a384eaa200c3677068e81f3d2f29161ba301b3e2f7ae067b847c6
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 16068 bytes
SHA-256: 5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8

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