Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e3fdcae2b67dac…

MALICIOUS

PDF

70.7 KB Created: 2021-02-23 23:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90894224a6040731267d3f63fcb61901 SHA-1: a45fba814efbb948adda1b0739421459c899567b SHA-256: d0e3fdcae2b67dac2e636e4bbaeee13610a30f01057746fa2f09c8d66fb875cc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple disposable domains and link farms indicates a phishing or malware distribution campaign.

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=piggy+boom+hack+2020 In PDF document text
    • http://outputqwvk.space/47021684176iem90.pdfIn PDF document text
    • http://itravelimpressions.com/how_do_i_connect_my_laptop_to_my_verizon_mobile_hotspotb5ox3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_600146f04537e.pdfIn PDF document text
    • http://idealica-ufficiale.site/veda_mantras_telugu_freexwx2q.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/iOgfhen/8947244857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5ff4a1afd7cf9.pdfIn PDF document text
    • http://krokoboko6.xyz/sesadojuwuwusixewevrz3kw.pdfIn PDF document text
    • http://paringljkf.com/wavewefulutezegujefipugudo1aap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447447/normal_60014ab0ebe73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5ff77a5f8d21b.pdfIn PDF document text
    • http://axacheat4.xyz/92990685721eecgb.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/2uhd0z0/epic_race_3d_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/jdhasXf/survival_manual_example.pdfIn PDF document text
    • https://cdn.sqhk.co/kelufuro/iaibjhI/21850526057.pdfIn PDF document text
    • http://reduslim-siteofficial.site/skater_xl_maps_ps45sxel.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/ijPgfdA/ways_to_keep_mosquitoes_away_from_home.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443619/normal_5fe508bef3fb1.pdfIn PDF document text
    • http://organicnu.info/290675246472kg56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuberifanarov.rf.gd/jakarisu.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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 5488 bytes
SHA-256: d127f998a6d7c0c9ccc9e6493b528a9c16f68e45a66b29810b2b2ab0deecb871
font_01_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 11352 bytes
SHA-256: 3a5fe435e430f648e473c6113c12cc256822a856de00a717bad23d10a72da3ad

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