Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc11b0b84ab22fe…

MALICIOUS

PDF

96.1 KB Created: 2021-02-26 15:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b4295a74f6e348abb9739a61fc9b0c3 SHA-1: fb1ecb629c8c58bd0e06afb7669e3917f2cac9ba SHA-256: efc11b0b84ab22fe58db6843ffa1dfa966ac29dce44a5fda08048d620816e628
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik?utm_term=personajes+el+nombre+de+la+rosa+pelicula'. Additionally, ClamAV detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and an ML classifier assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting a phishing or redirection attempt.

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 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.
  • 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/strik?utm_term=personajes+el+nombre+de+la+rosa+pelicula In PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/107dc154c931223.pdfIn PDF document text
    • http://xukekutotipepet.iblogger.org/schematic_minecraft_s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_60172d59a5f02.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/cute_actress_photos_free.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/ludat_wazupuroz_jekin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413005/normal_5fe5ea9e2411e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478688/normal_6009aad32ad08.pdfIn PDF document text
    • https://pisaxegeb.weebly.com/uploads/1/3/0/7/130775455/peviruzudili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/marguerite_duras_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/60933645727.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/misesopuvoladezulebap.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/85621960492.pdfIn PDF document text
    • http://nunusama.rf.gd/45441980478.pdfIn PDF document text
    • http://jeduxotikeg.rf.gd/xipegeroji.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/black_desert_online_dark_knight_class_guide.pdfIn PDF document text
    • http://siwegop.rf.gd/harley_davidson_extended_service_plan_transfer_form.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_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 5436 bytes
SHA-256: c5719cf0358978b788545919967e2fd9782d80f2368b785d37775077772e83df
font_01_sfnt_off00014b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B85 12256 bytes
SHA-256: 1095eaa1cd9a1ac8ae4c520fa14dd27a9ba8c96aa9ca6f45eb42c37d59d90709

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