Malicious PDF — malware analysis report

Static analysis result for SHA-256 634d76a700dcf73a…

MALICIOUS

PDF

143.9 KB Created: 2021-02-09 11:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fe1a9dd42be328b92b3eb6ec776f8f6d SHA-1: 745016f16d1822aeb014d836d6d7da9ec4f48990 SHA-256: 634d76a700dcf73af032c1c9b9e04c17039730e77f99466e2f996243c5713205
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating that some of these links point to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of multiple links to potentially malicious domains suggests a phishing or redirection attempt to deliver further malware or solicit user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=list+android+os+code+names In PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/6b74c46a78.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/ludogemawikal.pdfIn PDF document text
    • http://feelslike35.com/bill_cipher_wallpaper_android35s99.pdfIn PDF document text
    • http://xapozibun.22web.org/let_it_go_sheet_music_frozen.pdfIn PDF document text
    • http://arm-watch3.club/switch_pro_controller_blue_light_stays_onlyyvi.pdfIn PDF document text
    • https://roponisuzarepi.weebly.com/uploads/1/3/1/4/131452815/temilamuz_nemovexixa_fezizofugeze.pdfIn PDF document text
    • http://rubeatyshop.xyz/94453409172ese1v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadoxijumulop.epizy.com/kaneresibukubagemol.pdfIn PDF document text
    • http://kinikodiraxo.rf.gd/marvelous_designer_cloth_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/categorie_catastali_immobili.pdfIn PDF document text
    • http://vumavoralamo.rf.gd/98419407322.pdfIn PDF document text
    • http://fiwusinuba.rf.gd/90732624833.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/credit_report_dispute_online_or._mail.pdfIn PDF document text
    • http://nazubaj.epizy.com/60421807725.pdfIn PDF document text
    • http://nemagigorame.epizy.com/jegavab.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/anti_ragging_form_du_llb.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_off0001f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F713 4996 bytes
SHA-256: a968ef91077cc6a6f81489d262d22ddde572a1c6b315727d41a88c8cc0a07490
font_01_sfnt_off000207fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207FD 11976 bytes
SHA-256: 24ecfdd343e50a64854e5dde95d8f047cc881dde916e7c4d36c193c4566e3fa8

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