Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65ad3f6d3b4c4ba…

MALICIOUS

PDF

66.8 KB Created: 2021-03-01 00:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cb8813295f424b481d027b3da20b8f31 SHA-1: 521a7b35ec9df910f7d5e096d5b7dc5232009cd5 SHA-256: d65ad3f6d3b4c4ba4c0e48647f4837bc0ff31a2ce14265eb47ca18af2e3367ea
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious 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://crophysi.ru/wix?keyword=nike+team+hustle+d+6 In PDF document text
    • http://gekifek.scienceontheweb.net/fixidoda.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/navy_blue_and_black_old_skool_vans.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/QVidv89/59638295611.pdfIn PDF document text
    • http://profer-opt.ru/sibarabafukufexolebasasic6btj.pdfIn PDF document text
    • http://pipvip.ru/3-4_skills_practice_equations_of_lines8hwfk.pdfIn PDF document text
    • http://tehnotop.store/322580752507vrnb.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/40886045752.pdfIn PDF document text
    • http://com-connexion.xyz/excel_enable_spell_check_on_protected_sheetotwlo.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/gdgjmjc/box_packaging_mockup_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5ff2138d85544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368970/normal_5ff69d2824759.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/iayXjhO/bluetooth_music_player_buy_online.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/5217278344.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/41384206265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5fe956ee2c972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5fe2c0b84778c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/76040597159.pdfIn PDF document text
    • http://titugol.atwebpages.com/27018410604.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_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 5156 bytes
SHA-256: 69598087bdbc6509c8ff025d6348bcb7427ab34b33012fcd2a2ff679dcf89055
font_01_sfnt_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10072 bytes
SHA-256: 2ab468249fca7747d946fa5e465cafccc21c5beddab57ad249b23fbb08f1ec13

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