Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5579e6046245627…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 04:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b5570ed2b425a09e69e94ba310dca1d5 SHA-1: 4e2881171240cee9ca1f9e02bb70063ebcb42fa7 SHA-256: f5579e6046245627aaf93d81b7f045ffa58a367e8b316d4b838e5bd3d0a07882
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, including known malicious redirectors. This behavior is indicative of a link farm designed to distribute malicious content or phish for information. The ClamAV detection and ML classifier further support its malicious nature.

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/strik?utm_term=tork+timers+home+depot In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_60148275d1254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_5fd7d72edd08d.pdfIn PDF document text
    • http://cooldomen.space/sample_of_a_simple_literature_review62drs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6011bb0fa21d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5fec08224fb9c.pdfIn PDF document text
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/4810904.pdfIn PDF document text
    • http://prizyivnik.ru/cisco_packet_tracer_version_5._0_freekfi4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_60128dfcb7787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5fcee1897bbcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fc6568069938.pdfIn PDF document text
    • http://richteam.site/fipuwajadezofuroplhvws.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fee8e4cea96d.pdfIn PDF document text
    • http://nosinoski.shop/kaanchi_the_unbreakable_full_movie_480p9lxai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_60117dd24e3f7.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/vesubodufisi/chennai_express_full_movie_hd_free.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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 4968 bytes
SHA-256: 2f1d140ef54e2f3edbf6e52ccaa5f5a9479c325f336c47b4f3dcfb7f0ef29acf
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 11364 bytes
SHA-256: d37c988a3281f2cbf3217dda2daf9b379312592b7f56ce8c0805b9476dbcbeab

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