Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99e050ba3bad5d1…

MALICIOUS

PDF

79.1 KB Created: 2021-02-24 18:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 558d64ad6603f3416c4cb82b8adda6fc SHA-1: b2ad4998d61033e160144bacf85a3ce57123e507 SHA-256: b99e050ba3bad5d18e4a5ee0b9ee521201beb139d55400e4e30b873b59b45aca
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this file as malicious. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=magna+carta+main+facts In PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/tawilujoduku.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/how_do_i_reset_my_idylis_air_purifier.pdfIn PDF document text
    • https://cdn.sqhk.co/salefudodid/YKI8cwJ/xojigez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fdc4f64359a0.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/how_to_make_easy_ribbon_bows_for_gifts.pdfIn PDF document text
    • http://zepofevof.22web.org/my_talking_tom_gold_run_mod.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/67198874447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472479/normal_60014816e0206.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/11856501038.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/jigJ3XH/merchants_tire_and_auto_service.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_6011592e40b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5fd5f6efef09c.pdfIn PDF document text
    • http://tekufebuxu.iblogger.org/how_to_change_samsung_imaging_unit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://genenapukiral.epizy.com/yahoo_finance_data_in_r.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/57844966455.pdfIn PDF document text
    • http://takoxun.epizy.com/worufeji.pdfIn PDF document text
    • http://rojaxenutu.rf.gd/kindergarten_reading_comprehension_worksheets_free_printable.pdfIn PDF document text
    • http://walagezumeg.epizy.com/cartoon_movie_mp4_3gp.pdfIn PDF document text
    • http://jezawijevot.rf.gd/kjv_bible_offline.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 4732 bytes
SHA-256: 8df9f9ff05bb3472f0d367cd3c9aed1e070614d56fe8e20497c76a78bed6843a
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10540 bytes
SHA-256: ea8b8024411cc354760d0668558046e6bcf1b5700793b60ad1336b18de10c75a
font_02_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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