Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae15e18dbea18f65…

MALICIOUS

PDF

86.3 KB Created: 2021-03-12 01:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 13d9a25a0e3564dcd0453ac518740361 SHA-1: c4fb6ed74901e822629631abb32cbf5f7ea5b393 SHA-256: ae15e18dbea18f65f5597eae2684b55ffd9d54a60f83910505708879393326c5
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, commonly used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/award?keyword=school+budget+management+pdf PDF link annotation
    • https://cdn.sqhk.co/tegiriwepaj/UMheg8M/post_its_online_board.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/8hjqtW4/37119550106.pdfIn PDF document text
    • https://cdn.sqhk.co/peruvereraba/fjhgchj/application_of_calculus_in_computer_science.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/07hbg9b/grid_vintage_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5fd7dea3301c6.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/JhiiehB/41370022416.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/iticJjb/formal_dress_code_for_wedding_guest.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/LggQV7i/infection_control_today_bias.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_60027330e2505.pdfIn PDF document text
    • http://pe50off.pro/level_9_skiergdzae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6049ef2e8d4b9.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/ijjjWOs/evolution_game_yanderera.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/c3hi5ih/terisadave.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/fNQoife/u_miami_basketball_recruiting.pdfIn PDF document text
    • http://parrrtner.xyz/612179321105lqqo.pdfIn PDF document text
    • http://leqqurint.online/racing_limits_apk1nd2r.pdfIn PDF document text
    • http://netewe5.xyz/kafasasuluuq8kw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divexikav/jogiv.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/window_envelope_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/gotejekizatapokufavi.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/como_actualizar_java_en_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/38415651838.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 5540 bytes
SHA-256: 3de3329813747d11df549720f55b4c1ce5b7964d81c941d39ed873ec8ae80274
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 10804 bytes
SHA-256: 6010ef2ca27ba61330fb418614b45442aaa950675982700d3e24a8d744ffcadd
font_02_sfnt_off000136a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A2 16164 bytes
SHA-256: 731768d427d4e765fcf06156833c7a8b33611a9f9c7c28c95afcc3719f046f5d

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