Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a4a929e755785f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-18 05:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bda2b6a504562550d6b658c7a4d9e49 SHA-1: 829d9ae109f0b6358158d50b56d723c23738be73 SHA-256: 75a4a929e755785fb1c33f51bb1efb88ec1b003d57bab28dbaae6228aa79ea1f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a significant number of external links. The heuristic 'PDF_SEO_LINK_FARM' indicates that the PDF is designed to host a large number of links, likely to redirect users to malicious sites for phishing or malware distribution. The document body is heavily obfuscated and appears to be a lure, referencing 'Kombucha tea recipe pdf' while containing numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=kombucha+tea+recipe+pdf
    • http://vakakuwumegus.22web.org/roast_beef_recipes.pdf
    • https://wiselulusitafe.weebly.com/uploads/1/3/4/8/134892864/19cc21b5371.pdf
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/4227643.pdf
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/kofavexivofaxat_sejonuwopabad_xakejada_murujigux.pdf
    • https://mijonogopo.weebly.com/uploads/1/3/5/3/135327524/wudavebedutexovesug.pdf
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/632251.pdf
    • http://sujisopoboraru.iblogger.org/howden_buffalo_fan_engineering_handbook.pdf
    • https://cdn.sqhk.co/vumuwilaj/rjgoqgf/collage_photo_maker_photo_editor_with_sticker_filter.pdf
    • https://cdn.sqhk.co/folamudoj/gjbdlP8/easy_to_use_smartphones_for_senior_citizens.pdf
    • https://cdn.sqhk.co/fulaxanew/N77ZGih/how_to_draw_the_marvel_logo_easy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/7ac5efd8-3beb-4e97-b99f-7bc89bb0fdb9/frosty_the_snowman_full_movie_2005.pdf
    • http://bolomubimuga.rf.gd/jotul_f500_prix_neuf.pdf
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_c6f9d34e94214f91a7f0489be43a0587.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be685cee-5705-4333-a7da-fcba0d0810f5/bosch_axxis_washer_stops_mid_cycle.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_afb4eb2c9a3f4e6196cd21dd58980836.pdf?index=true
    • http://kikexufan.epizy.com/statistical_analysis_of_laboratory_data.pdf
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_5d45b35dbffa4a07869ca87ccff2d6f2.pdf?index=true
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_87510d74b6cb462bb18481231c1a300e.pdf?index=true
    • http://xegukamadoso.epizy.com/mit_math_for_computer_science.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90c.bin
63dbc006d7a234e58ac65cb7b7ca645090bb1cec175a6aeb5bbae189d265dc9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5068 bytes
font_01_sfnt_off0000fa49.bin
7c2b62b12e05a50dba1b22c2f26c40cf0ae3c198b26a858f32f6f3afeda9de5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 10732 bytes
font_02_sfnt_off00011ece.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 4324 bytes

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