Malicious PDF — malware analysis report

Static analysis result for SHA-256 586e04add1fbdc29…

MALICIOUS

PDF

73.5 KB Created: 2021-02-13 04:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4cbb825aa8f4f92294592484708d95c6 SHA-1: 4711e9f77d31bc3b65aceaab31c1709c0e6d3aa4 SHA-256: 586e04add1fbdc29cccd1cf2f7b4aacefbe34ca9f3310eb3ea4dbca0471dd9e6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links that redirect to known malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Alan Turing enigma libro pdf', suggesting a lure to entice users to click on the malicious links. The presence of multiple disposable hosting links further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=alan+turing+enigma+libro+pdf In PDF document text
    • http://terem.space/17406815985o2q2c.pdfIn PDF document text
    • http://krokoboko6.xyz/solinuriwamadiguzufipwqul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_601b8923cba3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_600f1c06e8ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5fd26b8e34f43.pdfIn PDF document text
    • http://ziwegiwe.iblogger.org/english_grammar_basics.pdfIn PDF document text
    • http://lastasked.com/ba_private_date_sheet_2019_punjab_universityrlw80.pdfIn PDF document text
    • http://lusejifunod.22web.org/netzwerk_prfungstraining_goethe_zertifikat_a2_answers.pdfIn PDF document text
    • http://moreronofi.iblogger.org/14965557646.pdfIn PDF document text
    • http://euroshopmn.space/android_version_9_devices8ho5d.pdfIn PDF document text
    • https://mepokebifonamos.weebly.com/uploads/1/3/4/0/134096039/darubidome_lelafa.pdfIn PDF document text
    • http://gesemalisezusa.iblogger.org/auto_tune_adobe_audition_1._5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426696/normal_5fee8b92b4bb0.pdfIn PDF document text
    • http://atomyimperial.ru/agneepath_full_movie_2012_hd_480p8o6z6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesitebogi.epizy.com/employee_of_the_month_certificate_template_microsoft.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/4205062447.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/zatapujugimus.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/tevemijav.pdfIn PDF document text
    • http://zegokufa.epizy.com/blues_piano_licks.pdfIn PDF document text
    • http://kikexufan.epizy.com/samsung_vrf_catalogue.pdfIn PDF document text
    • http://xorikija.epizy.com/cambridge_dictionary_free_for_windows.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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 5312 bytes
SHA-256: d3d083d2fb774e33d90d3a52a5367b9168e1b0df9676ebfffffc4f278038394f
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 11100 bytes
SHA-256: eaaaa0f0e27bc24e7f06c24f9c40836a4ad974501dde6e376a3084d5288aff58

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