Malicious PDF — malware analysis report

Static analysis result for SHA-256 27174f5e31237d19…

MALICIOUS

PDF

116.3 KB Created: 2021-02-23 00:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a2125aa272a27452f9935862acbfce58 SHA-1: e24d3b8376fea350985d91eebde88d04ccd33577 SHA-256: 27174f5e31237d198e5aaa16bd8f5708fd124b1ad06ffd36d155efd32a04c76c
76 Risk Score

Malware Insights

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

The PDF document uses a lure related to 'College algebra 12th edition answers pdf' to entice users to click on a link. This link, identified as a redirector, leads to a malicious domain. The ML classifier strongly indicates maliciousness, and the presence of multiple embedded URLs, some with unknown reputations, further supports this assessment. No scripts were extracted, but the overall pattern suggests a phishing attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://s3.amazonaws.com/zibenoroduzuw/cannot_binance_ios_app.pdf In PDF document text
    • http://adv-workshop.site/jsc_mark_sheet_2018_with_numberuxtqw.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/u7iiNz1/drum_set_parts_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/who_created_the_first_light_bulb_in_the_world.pdfIn PDF document text
    • http://goromeo.club/anganwadi_form5kgzj.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/Diegi7R/dapuburaruzelegegevodu.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/ZppjeRb/assessment_in_science_education.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/eQjcjcA/general_hospital_spoilers_week_of_august_24_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/2jmggCH/ravensburger_3d_jigsaw_puzzle_disney_castle_216_pieces.pdfIn PDF document text
    • http://nubolats.xyz/shazam_lite_apk_mod8ryet.pdfIn PDF document text
    • http://herss.space/mowojawixavajurazagaphnu9i.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/lenovo_ideapad_700_bios.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/81586202513.pdfIn PDF document text
    • http://uggi-ugg.com/91595240705ju57n.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/7jbgjgg/zuzepivaxepulazetelaf.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/ZqZBZ9m/vulunabetoxufazas.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/ifhuASK/modern_warfare_3_weapon_list.pdfIn PDF document text
    • https://bologen.ru/strik?utm_term=college+algebra+12th+edition+answers+pdfPDF link annotation
    • http://www.ascendercorp.com/In extracted file (font_01_sfnt_off000169d6.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_01_sfnt_off000169d6.bin)
    • 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 extracted file (font_01_sfnt_off000169d6.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0001ab72.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0001ab72.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA3 3120 bytes
SHA-256: 16a0685b1af8f7ff3286410c82d065b2ef9dd16f5cc5e004aadb0dd239daad33
font_01_sfnt_off000169d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D6 5624 bytes
SHA-256: 6ceb40a36faa0cde2c887475110cc3eac9d2e5dae6e27ca7e7d7722e35cd3c7a
font_02_sfnt_off00017d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D04 14032 bytes
SHA-256: 02e160552653714206a20f52e93f94e20344cc7a0535174db07699a42a00f5ec
font_03_sfnt_off0001ab72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB72 16316 bytes
SHA-256: de10ad672e19a85dbffbe507a47f2e6c33af07a7a8ab0b97eda7e3860f61c561

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