Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf73ae9827c0e6d…

MALICIOUS

PDF

89.2 KB Created: 2021-02-27 17:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 764877fd51242bac6823238aedabef14 SHA-1: b23577d043268fc6b8eb2c53958db176422727db SHA-256: 4bf73ae9827c0e6d308bc0b24760655cd78fd386e914038b9e1143c63ddcb74b
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, indicating a phishing or trojan payload. It contains an embedded URL that, when clicked, likely leads to a malicious site. The document body, though heavily obfuscated, suggests a lure related to fitness and weight loss to trick the user into clicking the malicious link.

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://vilenefex.ru/wb?keyword=how%20to%20start%20a%20workout%20routine%20to%20lose%20weight PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420451/normal_6007009a3a5fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_601d2edb959ed.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/dhjiRjf/21271606987.pdfIn PDF document text
    • http://tapadobav.iblogger.org/malaxupemokelas.pdfIn PDF document text
    • http://meleworofazob.22web.org/sojoganevowuravaxagujij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_60029d319f44d.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/uhbhgjx/tesiloxejukotol.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/a9hbBfr/xunalibomuwajen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_6029b5761c38a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_6032d5b85e561.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/i0qkhgu/22999743295.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/bubisifapagefe/movies_hd_telugu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/gonifokujamawedukigunati.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/the_dark_tower_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/dell_optiplex_760_diagnostic_lights_1_and_3_flashing.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/how_to_be_happy_in_your_20s.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/checkerboard_vans_platform.pdfIn PDF document text
    • http://jubadoloje.epizy.com/certificate_of_completion_template_portrait.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 5064 bytes
SHA-256: ac076761b9ca2e87a50d51617f037196f674d0c7e16009f8c21e756625b3018f
font_01_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 2088 bytes
SHA-256: 0c8399eaf9d95363b27a5883d425d83c6e4098603e3b818f7c952b126c33a893
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 10948 bytes
SHA-256: 3a3589dbbd6cfc78e8efb4b3a1656219afa2946f2d904b853166b7f21df87af5
font_03_sfnt_off000141da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DA 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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