Malicious PDF — malware analysis report

Static analysis result for SHA-256 742f4a59f5db0ca6…

MALICIOUS

PDF

71.7 KB Created: 2020-11-18 13:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c462d00458d1a5da15130fcc4e711ebe SHA-1: ea417d4bb9067e44147870600b64e5e7632bf54b SHA-256: 742f4a59f5db0ca6a5ee4cdfab3cb73c71e0844d5f4bb6d7e2151f07f1e0f9ab
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=leveling+gathering+ffxiv+50-60 In PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/potasejek_kavifuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f9b44feea896.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/zasipolamulowogum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_5faf28884311e.pdfIn PDF document text
    • https://zesukixugedun.weebly.com/uploads/1/3/4/5/134593530/ledunujosav.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/79c17b7bd6f3b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a63d08-1f5b-41e7-8319-0dbb9096578a/mainstreaming_and_inclusion_are_similar_in_that_both.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ae54c1-6e38-4de4-a3ae-25614d30ba8d/nexovuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc5c645-fb0a-44d3-b1ad-6d971dc9cedd/35204902986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b897c5-229e-40c7-b043-7c56fa11695c/lejagilawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/694a6c32-45be-44c5-a6cf-6d4a4cc5d0bd/lord_i_need_you_sheet_music_satb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863ba4a5-b791-4167-8a91-008d55f2a566/renivunakavaxef.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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 5372 bytes
SHA-256: 50a993519ba926a5fb93e82852263914c4ce376c5fc976321ca9778f24fc77ba
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 10364 bytes
SHA-256: 38d1a00e68fa92a79fda235ae469ee9b95ee2c4d8a37aee9135d9e29135292f1

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