Malicious PDF — malware analysis report

Static analysis result for SHA-256 223cbd579173a619…

MALICIOUS

PDF

89.8 KB Created: 2021-02-21 20:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 40b4c940e7a0e449833bc269fc9095c8 SHA-1: 57ca511ecfd89bd310f3b2db9df1795e637af4e4 SHA-256: 223cbd579173a6195d57777e80d36e510a9b0af01aad4acb3b4073e7f575b7b0
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leveraging social engineering to trick users into visiting harmful sites.

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/123?utm_term=what+is+a+discontinuous+innovation In PDF document text
    • http://stav-games.ru/10696091089q205f.pdfIn PDF document text
    • http://alcexpress3.xyz/air_traffic_controller_job_requirements_canadaimq1h.pdfIn PDF document text
    • http://pebimubegema.22web.org/39297453883.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/Y5DFggZ/jumpstart_1st_grade_2000_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/ehblESF/tajirewop.pdfIn PDF document text
    • http://wgathering.org/paulo_coelho_aleph_franais_gratuitlvhni.pdfIn PDF document text
    • http://tisiner.iblogger.org/gezel.pdfIn PDF document text
    • http://xxlmature.site/visogexixetawilatelaxhla8x.pdfIn PDF document text
    • http://m-ryanaf.site/password_cracker_for_sandisk_usb_keye3xpt.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/jj0Fwgi/86664808496.pdfIn PDF document text
    • http://kozovuxe.22web.org/50821710157.pdfIn PDF document text
    • http://nibofope.66ghz.com/19818076059.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/XJihhf2/free_fall_3d_svg_files.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jjbStjj/yeetus_the_fetus_birth_control_case.pdfIn PDF document text
    • https://cdn.sqhk.co/voromerubagu/ihgyhaD/sapuvitis.pdfIn PDF document text
    • http://supsun-aero.com/newurabubevopidibelusulofny1g.pdfIn PDF document text
    • http://sodaapp.pro/kokugamuk1i5b.pdfIn PDF document text
    • http://poverkavoda.website/us_army_counter_stickman_apkhveeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesaforasipu.epizy.com/anodised_aluminium_sheet_suppliers.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_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 4972 bytes
SHA-256: ae1685d05ac4068737dfad2db7e98c704f20cd9e7646b698d16145573acfeef8
font_01_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 11072 bytes
SHA-256: feb7572f8c44cb1208c4520a16fb9ae0eb3d6a7f1dc7814213f428bf8843e5ff

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