Malicious PDF — malware analysis report

Static analysis result for SHA-256 82550a1923b40e1a…

MALICIOUS

PDF

113.0 KB Created: 2021-05-16 12:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c47af197a50f85baf8a76e4df5facfad SHA-1: 58322268ae8c05e8ee8b8a6379419cf3119755d5 SHA-256: 82550a1923b40e1a538f4badbe551ebd13e89291cc8a8a64907d3fe605dc8b89
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a 'Conair fabric steamer assembly'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=conair+fabric+steamer+assembly PDF link annotation
    • http://fogozuvonuw.66ghz.com/kundali_matching_free.pdfIn PDF document text
    • http://kudezixajuxuni.66ghz.com/zijaxivoxalaxutatepuk.pdfIn PDF document text
    • http://nukels.xyz/411769523367zqn5.pdfIn PDF document text
    • http://impergamon.com/esl_speaking_club_lesson_planswkb76.pdfIn PDF document text
    • http://antileqphh.site/wexarejoruxatixavepixizp3lw3.pdfIn PDF document text
    • http://tumbochka.space/244301482000ukn9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_603b9d91e040e.pdfIn PDF document text
    • http://smartbright.club/how_to_load_a_bobbin_on_a_singerwzgq4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fcf3d009a5cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_6027ecb5cea60.pdfIn PDF document text
    • http://wopebexe.66ghz.com/jigezifimemojejav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487386/normal_5fdeafe5cd31b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wedinuvudazoxo.rf.gd/enciclopedia_baker_de_apologtica_cristiana.pdfIn PDF document text
    • http://furivel.rf.gd/language_arts_practice_worksheets_6th_grade.pdfIn PDF document text
    • http://xodolipifonabo.epizy.com/18234817.pdfIn PDF document text
    • http://legatuwaw.epizy.com/papukijujetanomudapejuwu.pdfIn PDF document text
    • http://jofuraf.rf.gd/verabekegugunapewomup.pdfIn PDF document text
    • http://tomabev.rf.gd/rebelepuzawoxeta.pdfIn PDF document text
    • http://puriwevusireda.rf.gd/how_much_does_a_permit_test_cost_in_florida.pdfIn PDF document text
    • http://bekapoza.epizy.com/5449975390.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB1 6672 bytes
SHA-256: afbaa728dee9c416fa2f5b722cb6dbe72d86fb227de0f823b004da909be7a231
font_01_sfnt_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 4504 bytes
SHA-256: 8e9d4969b54a82ed143e5ac2b5e86e7b251aa099ddbbfc9a02930962e7b1459c
font_02_sfnt_off00014e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E19 5080 bytes
SHA-256: 617615a872dc07c4c07c3f362d5add81722d717d5e3fad7e72f37c92a4a23b10
font_03_sfnt_off00015f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F47 15044 bytes
SHA-256: acfdacfea6078143d3cedb3f4a38c547b41f1a7cf81df0b726cdc4c08d7cb101
font_04_sfnt_off0001915e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1915E 16392 bytes
SHA-256: 1e95a18379054839e551448df54075618851605b8cfe32e6e7559a6810ecd847
font_05_sfnt_off0001a766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A766 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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