Malicious PDF — malware analysis report

Static analysis result for SHA-256 217daaf4a57641fb…

MALICIOUS

PDF

75.2 KB Created: 2021-03-31 11:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e732a350e45532329132dcfcb716c4eb SHA-1: 9ccc8977b825283de7b1b43cbcdb078f27c53a82 SHA-256: 217daaf4a57641fb026aaeea07892c11bf98b7337d7eb657d7d8259a707d5b0e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to sprinkler systems, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=rain+bird+sprinkler+system+not+working PDF link annotation
    • https://cdn.sqhk.co/novoganug/gjGcSic/dajaxedinutilefidamesatu.pdfIn PDF document text
    • http://kigurumi.org/odisha_aso_exam_booksr62sp.pdfIn PDF document text
    • http://bodyita.space/50704409381foriw.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/egZS1SU/fudilaroropupixapa.pdfIn PDF document text
    • http://wordsideget.top/nelson_grade_11_biology_textbook_onlinegeiby.pdfIn PDF document text
    • http://vsspb.ru/146828780237pwq.pdfIn PDF document text
    • http://printnews.site/nepilelumedejururuzomisep8sk3n.pdfIn PDF document text
    • http://bighome.space/rusixuxokufurabagewa1a6ek.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/fzYvsvC/68589040651.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/98528536462wre0s.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/dhdjaLe/blue_circle_red_cross_road_sign_uk.pdfIn PDF document text
    • http://all-gopro.com/screen_recorder_software_free_full_version3jtoy.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizozife/idjc6he/63508939866.pdfIn PDF document text
    • http://islandlandscapesbb.com/70045744247tlels.pdfIn PDF document text
    • http://reabook.online/skype_free_latest_version_2019ox632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_19332a573e754b0f8409b1652ba688bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/82517940382.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/how_do_i_manually_update_a_table_of_contents_in_word_2016.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_5f344db742d742bcaa7fb3bb27fd4c84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/65695811537.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 5684 bytes
SHA-256: 582b3d8aaf6306ced57a4beb9c39ffb2d1cb4e79b4e211184d0d13ee160629ee
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10620 bytes
SHA-256: 1628d21155342c90fc4a884014269505c8b3e83bfed90431d16c3bc338288dda

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