Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3a908902263bc7…

MALICIOUS

PDF

72.0 KB Created: 2021-04-30 05:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 50d2d7c330f3c10bccc00e23fea8b32e SHA-1: 3e80f3ba56af5278d5917aa51f048a722b1bc1a6 SHA-256: 6e3a908902263bc717d550f4a8d71bd1e4c9479ae7c1889c7f2ab2aceae15638
204 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm. Heuristics indicate these links lead to malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=asus+xonar+dgx+sound+card In PDF document text
    • http://microbladingeyebrowsdallastx.com/friends_season_1_free_with_subtitlest8nap.pdfIn PDF document text
    • http://idealica-italiaoficial.site/75882329826rzrjw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_604353e5510a1.pdfIn PDF document text
    • http://armada.technology/lb_in_to_n_mua49l.pdfIn PDF document text
    • http://myfirstsite.xyz/mantak_chia_techniquesxigss.pdfIn PDF document text
    • http://prizinsta24.online/37433286935ev54e.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/dtjcmuy/76865256731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd380f988367.pdfIn PDF document text
    • http://twitter-center.com/wizardry_6_automap_modn0hm9.pdfIn PDF document text
    • http://vawuxipofuf.iblogger.org/zelaweputol.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • http://winoorama.space/125998306500g6ld.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/lost_islamic_history_in_urdu_book.pdfIn PDF document text
    • http://activa-fb.com/friedrich_nietzsche_a_nihilisthj5fi.pdfIn PDF document text
    • https://cdn.sqhk.co/pegiridireva/adbjdcg/11775857648.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/notting_hill_book.pdfIn PDF document text
    • http://shopyou.online/trimble_r1_accessoriesvein4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedonufil.rf.gd/balkan_wars.pdfIn PDF document text
    • http://mawidinivetobi.myartsonline.com/moparemowivapadupolor.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/nizarugilujane.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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 5132 bytes
SHA-256: 9e7b3961b5ce376c95de71379184d05aa11e2ae058b789bb53aeb63a3b2b362f
font_01_sfnt_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 13176 bytes
SHA-256: e45c383974287b1fa463118b1b9be52d5c6c76fe6a73128de65f11c3c1526052

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