Malicious PDF — malware analysis report

Static analysis result for SHA-256 0667dc4c566be42d…

MALICIOUS

PDF

80.1 KB Created: 2021-03-21 07:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72111aa1cfb779acb64c6b06e8847434 SHA-1: d522d287f57eb5b66f52c57f4382abff668ab725 SHA-256: 0667dc4c566be42dbb38376d961789e777b885fba814cbc733f1a86080ebcb4f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, designed to redirect users to other PDF documents. The document body, though heavily obfuscated, suggests a lure related to 'vascular ultrasound worksheets'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/wix?keyword=vascular+ultrasound+worksheets
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/8979360.pdf
    • http://wuzafinof.iblogger.org/whatsapp_video_new_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6043882eb6ae3.pdf
    • https://static.s123-cdn-static.com/uploads/4414336/normal_5fee702e50658.pdf
    • http://xexudoj.22web.org/autotrophs_and_heterotrophs.pdf
    • https://kajilavenusifo.weebly.com/uploads/1/3/2/6/132683330/rakimuzit.pdf
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/dojewi.pdf
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/1c7eb7b21f4670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vokeri/kidefosasipobela.pdf
    • http://toxabose.epizy.com/95628112064.pdf
    • http://baxuset.rf.gd/how_to_teach_basic_sentence_writing_skills.pdf
    • http://xinudekewukipi.rf.gd/wifigude.pdf
    • http://tuvalej.epizy.com/blossom_hill_white_zinfandel_nutritional_information.pdf
    • https://s3.amazonaws.com/bidemewufa/safety_data_sheet_for_main_purpose.pdf
    • https://s3.amazonaws.com/bugutaj/ipu_btech_result.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/96485273724.pdf
    • https://s3.amazonaws.com/fotepopunaj/c_oops_interview_questions_for_experienced_professionals.pdf
    • http://zepenolewiri.epizy.com/gudotog.pdf
    • https://s3.amazonaws.com/xalexojaxipud/photoshop_tutorials_free_download_cs6.pdf
    • https://s3.amazonaws.com/xeruxaxer/games_to_play_2019_android.pdf
    • https://s3.amazonaws.com/werowibovezoje/mavotawubukibituf.pdf
    • http://dibulazovila.rf.gd/alphabet_practice_sheets_for_adults.pdf
    • http://buxodanukesidup.epizy.com/active_listening_definition.pdf
    • https://s3.amazonaws.com/padosumifubobo/81753332194.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd10.bin
cca0a26e2e956c692c334c1c13f9a42397559bc7574b76e18127a0c54c1cd740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 5148 bytes
font_01_sfnt_off00010ea0.bin
ee836550f7ada8c0ee8112f27bbc7f897edd444e81412e0917dacc64b4d5c74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 10716 bytes

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