Malicious PDF — malware analysis report

Static analysis result for SHA-256 c384f21a74cfe391…

MALICIOUS

PDF

70.8 KB Created: 2021-02-07 16:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 867c21c6531aeb898af8385d4e4a8a58 SHA-1: 2be4f815d8828a6983f2cd2e2114a37a8492ee86 SHA-256: c384f21a74cfe391462f3c879846af3504e42385843c0c36d5f0067b1eef6fe9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, appears to contain text related to 'chapter 3 test answers biology', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=chapter+3+test+answers+biology PDF link annotation
    • http://hookup153.site/tag_with_ryan_videosln0nu.pdfIn PDF document text
    • http://itactical.xyz/84631922821wxxpa.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/nichiren_buddhismcxd7m.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/ieahjij/foxivizetokiduxokeranez.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/9igjdJv/why_do_birds_flap_their_wings.pdfIn PDF document text
    • http://wordsidepost.top/fyre_fraud_watch_onlineezok7.pdfIn PDF document text
    • http://silvanozito.online/happy_new_year_worksheets4zkxo.pdfIn PDF document text
    • http://4kuhd.me/23044557617khil2.pdfIn PDF document text
    • http://legendnat.space/965816682452e15x.pdfIn PDF document text
    • http://zusozovi.22web.org/magiv.pdfIn PDF document text
    • http://kiwufaninini.22web.org/hubspot_sales_certification_test_answers.pdfIn PDF document text
    • http://bathforlegs.xyz/chocolate_cake_recipe_from_scratch_without_buttermilk_pancakesw4u6g.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/f1idhjO/31187981597.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/WPicpMD/5829387243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozoresupiz.epizy.com/national_arts_council_funding_application_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/62680646036.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/pozikejusaduvagivefofifeg.pdfIn PDF document text
    • http://liwusetokabozil.epizy.com/7860922109.pdfIn PDF document text
    • http://zedotedifajo.epizy.com/linkedin_ads_guide_2019.pdfIn PDF document text
    • http://felawikemuda.epizy.com/27700321678.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 5484 bytes
SHA-256: 7e5b57a54a8d24983a396e7fee02616a67ceae927ec06a11430f762474e9e9ad
font_01_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 10884 bytes
SHA-256: 57c442d146d872276e0c2db128ffe4c45575e587c238a25e92ac0ec912530f08

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