Malicious PDF — malware analysis report

Static analysis result for SHA-256 534bf5ccdbe24a24…

MALICIOUS

PDF

57.1 KB Created: 2020-12-17 08:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f0957fe5812b1e77fac350c9a4bb0487 SHA-1: 75b0ca6f021d7e428416ff02aa3f15c51e32f864 SHA-256: 534bf5ccdbe24a240a7abf444b58e983ad691cb1c137ed4faaeacfeb75c0ee35
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document's structure and link distribution suggest it's part of a link farm, likely intended for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/strik?utm_term=colin+kaepernick+t+shirt+designs In PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/ronuzeguluwudis-bupazijugub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5fd34f2ce4b35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5fcaf6e81261f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_5f9e2aa876012.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/c2b06c07e.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/regufuw_zifumebagup_jowajuvixiniruf.pdfIn PDF document text
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/dizikamedak.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/7502613.pdfIn PDF document text
    • https://guxuperotasase.weebly.com/uploads/1/3/4/3/134311101/kamupupekonupoka.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/wegemebufojafak/lab_visit_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/filifokugoxuxom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c5c06b97992eb57cf898/t/5fc62ac764571256540e8b16/1606822600281/how_to_make_origami_claws_with_square_paper.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf15a3570fb44d1c8407e/1606283611224/memesotirobem.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_off0000a896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA896 5304 bytes
SHA-256: 634f4c85b6b6ee747ead8a33b3cf2d74f01211626fd23e36d444226be54e3da8
font_01_sfnt_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 8532 bytes
SHA-256: 4aa5d16b248f00aad1736d8c308eecb3f8c16435c37ae9614ea0c7e9c1d12642

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