Malicious PDF — malware analysis report

Static analysis result for SHA-256 da081788fa265e9c…

MALICIOUS

PDF

83.4 KB Created: 2021-06-07 06:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8c13962038fee564759e9871cd00aa4 SHA-1: 47deecdbad3c1ab47721323b3948443764da1244 SHA-256: da081788fa265e9c54d4a3592561837698180625e56449033dbbc92f8ab225b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or redirection scheme. The document body, though partially obfuscated, indicates a lure related to tax returns, likely to trick users into clicking on the embedded URLs. No scripts were extracted, but the presence of numerous external links points towards a phishing or credential harvesting attempt.

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://wastran.ru/pbw?utm_term=how+to+include+marriage+allowance+on+tax+return
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5fc5e92718a05.pdf
    • https://cdn-cms.f-static.net/uploads/4451227/normal_605676303ab78.pdf
    • https://cdn-cms.f-static.net/uploads/4385421/normal_606b239548981.pdf
    • https://fefaxunitu.weebly.com/uploads/1/3/4/3/134399706/86c286b8b409565.pdf
    • https://cdn-cms.f-static.net/uploads/4459929/normal_6061e7b90b8f7.pdf
    • https://cdn-cms.f-static.net/uploads/4410216/normal_6030e22ad7d6a.pdf
    • https://static.s123-cdn-static.com/uploads/4475853/normal_5fcc252f84999.pdf
    • https://cdn-cms.f-static.net/uploads/4391340/normal_603217c95e66e.pdf
    • https://cdn-cms.f-static.net/uploads/4476011/normal_60135dc600360.pdf
    • https://sejelenowoloza.weebly.com/uploads/1/3/4/5/134518320/vobenefo.pdf
    • https://cdn-cms.f-static.net/uploads/4421056/normal_602803631aaf5.pdf
    • https://cdn-cms.f-static.net/uploads/4423427/normal_601daa41e6979.pdf
    • https://static.s123-cdn-static.com/uploads/4366978/normal_5ffe198c9b053.pdf
    • https://xovirekines.weebly.com/uploads/1/3/4/6/134648888/1e54904305fc89.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://botinuba.pbworks.com/w/file/fetch/144570558/52997036401.pdf
    • http://fufitan.pbworks.com/f/what_new_nintendo_switch_games_are_coming_out.pdf
    • http://lomubel.pbworks.com/f/stages_of_dog_pregnancy_week_by_week_photos.pdf
    • http://fuzobonesujo.pbworks.com/w/file/fetch/144727293/substance_use_disorder_treatment.pdf
    • http://mefijunov.pbworks.com/w/file/fetch/144420144/guerra_mundial_z_2_pelicula_completa_en_espaol_gratis.pdf
    • http://wezenibafasi.pbworks.com/f/how_do_i_change_the_4_digit_code_on_my_schlage_keypad.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_off0000fa14.bin
737c8cdb5967008db18170af49f3c8d1eace7be75a44875735b1d060995dddda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 5084 bytes
font_01_sfnt_off00010b47.bin
78a49a31b65815cd06c5791da082a29f1004194af27e33592fd5fde031385011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 11280 bytes
font_02_sfnt_off00013194.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 4324 bytes

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