Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2886c48a95eda4…

MALICIOUS

PDF

64.5 KB Created: 2020-12-07 15:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 73037b5b0761da363bddf9033cec0bce SHA-1: b7e759b8d7f25e7ce30a280ccb3879bff18f816a SHA-256: cf2886c48a95eda4612ffbc448a562099dee88622f0eb19b1723969c88314c93
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, and is flagged as a malicious redirector and SEO link farm. The ClamAV detection and ML classifier further indicate malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malware.

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://traffine.ru/aws?utm_term=ereading+worksheets+theme+answers In PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/1895434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_5fa73d8e066d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_5fbbb532a3545.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/zajonekoninejapujuvi.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/2648971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_5fbe28b62784a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5f904358a646c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5fabe1c6487f5.pdfIn PDF document text
    • https://jugusunoju.weebly.com/uploads/1/3/4/6/134625161/c1c0f0e4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5fa72c9c240ce.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/jeduzizonox/kenizoromivodarotunol.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/barilla__peynirli_tortellini_formaggi_makarna.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_off0000c0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F5 5320 bytes
SHA-256: 720eddf53ae4dbd4b644a818b694c6ea0c32a841426abc8915c5f293bce4dca3
font_01_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 10248 bytes
SHA-256: ad14d32d85adc7584dc5049277b23c72a9ba9ca49257cf424b24ade3ae4b8269

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