Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d51186f448f41b…

MALICIOUS

PDF

79.2 KB Created: 2021-05-15 11:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 23cb340df0c28f6cf07477d67e5f0e3b SHA-1: 7fd2837f4d5aa8e13adbee87f19d0f7198b4f9c5 SHA-256: 27d51186f448f41bae8a2a765c0aa0cb245423e2115375a49076c0cd76de43c8
136 Risk Score

Malware Insights

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

The PDF file uses a lure related to fishing knots to trick the user into clicking a link. This link, identified as a redirector, leads to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://golowaki.ru/strik?utm_term=how+to+tie+a+pulley+rig+for+sea+fishing PDF link annotation
    • http://biomanua.website/how_to_reset_a_venstar_thermostat6k3va.pdfIn PDF document text
    • http://mbfsopg.com/tegelileva73zvh.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/DYjiEIq/zefonavepidoxup.pdfIn PDF document text
    • http://unlockdeals.shop/kogitacxmmp.pdfIn PDF document text
    • http://prognoz-football.club/the_man_in_the_gray_flannel_suit_bookxhah1.pdfIn PDF document text
    • http://christinaanddavid2019.com/dobesaralukavovununm2wrj.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/ajfqo9S/bofezimoj.pdfIn PDF document text
    • http://pushbiz.fun/pajimoxuzejokesw273.pdfIn PDF document text
    • http://garant-ritual.online/219895011066jtu6.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwebobit/2X4aqie/49614630325.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/zuniverijesud/what_is_the_perfect_law_of_liberty_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/intermediate_1st_year_zoology_textbook_free.pdfIn PDF document text
    • http://bugudejekizukem.epizy.com/86620633464.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/what_is_the_best_chess_app_for_pc.pdfIn PDF document text
    • http://zadiriraki.epizy.com/23738922758.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/dovasuvakikuzako.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/why_wont_my_bradley_smoker_heat_up.pdfIn PDF document text
    • http://sijopar.epizy.com/68396721933.pdfIn PDF document text
    • http://xujekodade.epizy.com/calendario_2019_con_feriados_chile.pdfIn PDF document text
    • http://mexipokawe.rf.gd/16558434195.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/7597647132.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_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 5320 bytes
SHA-256: 4a9aa57f05d4041e4bbe4539cc0cda8c92ccc8bf0517db99939bc18f36a6899f
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 10704 bytes
SHA-256: ecffcf9195ae0b086153ca3c6c7056304ac72366634d32afdc9afcae48ccf7e0

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