Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c91c3790007837…

MALICIOUS

PDF

67.1 KB Created: 2020-12-01 20:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f5ea17aa1a86571a0b6954236c92cfa1 SHA-1: d8a59b257a494d7645eac9359607e440a06a435f SHA-256: b3c91c3790007837bfa1fc8aa48d139e4f90f96a0f2dc475fee7d25920bb1325
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/123?utm_term=2008+jeep+wrangler+starter+wiring+diagram In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5fa8e9ec61caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_5fa9ace169663.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/bitadidajamavu_savera_bumifa_danora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f9be310f0bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5f8faf96998bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fb427894ccb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_5f9a10d3de335.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/sezutuma/30710804701.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/jagufajanukebokosugari.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/maferaveragenus.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_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 5820 bytes
SHA-256: cdcc0e088b44161cee09c03b96d1a6fabe5170242651986d52833096f08395c8
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 9852 bytes
SHA-256: 2ede371be4958431e3c4db04c4040b94a732eb31c7cbe6d31178bff118e5357d

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