Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7704f7fde0c630…

MALICIOUS

PDF

79.0 KB Created: 2020-12-01 21:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c1f7492b7570af2ada13ca90a7ba63f4 SHA-1: 2e5c17e7a234fd6b325b4ff1352a080ad60580e6 SHA-256: 8d7704f7fde0c630aec4f76a7d8394cddfa34a5c5b628b716b156bbf55170b47
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 0.9959

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://traffmen.ru/strik?utm_term=troy+bilt+27+ton+log+splitter+specs In PDF document text
    • https://wotilawijuv.weebly.com/uploads/1/3/4/8/134852567/333ba.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/kulinisokakewi/comment_apprendre_a_parler_anglais_couramment_rapidement.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/fefidutukegafo.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/ez_frames_structures_and_shelters.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/sepop.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/62788440977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dab2f6e-9e73-4c2b-afea-1dd921366eb4/kuwerimobutenofewona.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/vitantonio_550_waffle_maker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167ec238-3fb7-4fdf-877c-ceaa9d7f2dc9/42932828424.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5084 bytes
SHA-256: efad2e162aacfa9303949fd3decb69eae06bc6ef7ff96a2f8a11f5d6a9787f0e
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 11736 bytes
SHA-256: 97a4df9c6f9be4c052c1d26ea802a1d53ab12ce4f35bc75ff905d152a49332e1
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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