Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85c5173f4d8ebe6…

MALICIOUS

PDF

71.6 KB Created: 2020-11-17 02:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 91d6d214c6fdeaebd4efafb4a42d9304 SHA-1: 901c9e9ac14f1f3b26c4ab9605fe405cc1a0d715 SHA-256: b85c5173f4d8ebe62ce9444e7977002e7064ece4bbe9aada5eda1957d940104f
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=que+signifie+la+phrase+je+te+connais In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f9ea6d55be21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f956db6af948.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/balixeboxusig-ronavixuz-jalifibiwudiba-dafus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_5fa4e54dd44d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f873be873d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_5fa2d281e3eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fa27078860d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f949224d538d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_5fb040e0e53f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5fac5e1ba7f4d.pdfIn PDF document text
    • https://xipurewaxo.weebly.com/uploads/1/3/4/7/134759043/fadewibavab-bepigajizejuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/norozovijalu/polujerovuwopajaj.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/william_rodriguez_md_miami_fl.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 5296 bytes
SHA-256: 396c8350f3fcccba529295825f77ca184942d8b8c23bd0d4c4f8992c04797578
font_01_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 12092 bytes
SHA-256: 6aa1bf60469fd956ec2fb3c4ea142dbde9f1e26044b294a1212660c8bd673861
font_02_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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