Malicious PDF — malware analysis report

Static analysis result for SHA-256 d919df11f20b5a9c…

MALICIOUS

PDF

73.4 KB Created: 2021-05-11 02:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e8174119f4ce267a2bd6fa5e9643c155 SHA-1: f95f50f93769c1ea2aa40622df1b75592dd13584 SHA-256: d919df11f20b5a9c07b73a8d40e4cf1cbf55874c4e91e284809c5e9efca53776
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO spam and redirector infrastructure. The heuristic firings indicate that this PDF is part of a link farm designed to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wb?keyword=cognitive%20behavioural%20therapy%20for%20dummies%202nd%20edition%20pdf In PDF document text
    • http://oyuncuxx.com/cuisinart_dcc-1800_vs_dcc-3200ur42k.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/vegak.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/884d1ee33813.pdfIn PDF document text
    • http://bilkan.fun/skyblock_update_log_robloxfi2jy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birelasali.rf.gd/el_par_biomagnetico_isaac_goiz.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_7e0d1b9400084ba38d9cf022f2242d14.pdf?index=trueIn PDF document text
    • http://dukutogesedu.epizy.com/free_templates_bootstrap_news.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/titan_report_bot_csgo.pdfIn PDF document text
    • http://turimovikukori.epizy.com/cafe_shop_business_plan.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_dfb87de4a89642419b4cc6ad4e71390d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/c_template_struct_default_constructor.pdfIn PDF document text
    • http://fuvibopa.epizy.com/form_u_payment_of_gratuity_act_1972.pdfIn PDF document text
    • http://gubogur.rf.gd/choices_mod_android_1.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_73ea8a3a34bd415daf68103f38640f4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/fexesojoguvezegeruru.pdfIn PDF document text
    • http://redunavazov.rf.gd/third_universal_definition_of_myocardial_infarction.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/19053484727.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 5792 bytes
SHA-256: c0d164590ec601592bc31784e3317e38ff6d20b2ba8b4b7060313d14831cea08
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 10768 bytes
SHA-256: dd9794b9731a9457266235cf291bce6257168b38eae444c1166a4e01fe9543bf

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