Malicious PDF — malware analysis report

Static analysis result for SHA-256 6382df8f77b85b21…

MALICIOUS

PDF

72.4 KB Created: 2020-11-10 12:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af779fb07bb864f1c0f77954bdb75f3d SHA-1: dbaef9f654f847d9fa2f5b93bfa663f3c087a9ad SHA-256: 6382df8f77b85b21522e9335a0a7bfddcbbc6dbfcd156e75e7fc88c02eaa78ee
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 0.9997

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/123?keyword=mimiga+cave+story In PDF document text
    • https://pojozuwowate.weebly.com/uploads/1/3/4/6/134631913/cdff8237cced2.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/460449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f8e55accf090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f8c5d9b7b178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_5fa5d49245784.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/426f15da-06f1-4425-a2b4-ef2403658c5a/muzofivodukubexizefumejiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90460a6-c8cd-4e4e-a2f6-3a9ba81e40c8/gisakatut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29eb9868-633c-4ef5-a5d5-9c1ab4d97688/wejako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e95a082-0bc9-42f2-8289-68f9304b6157/nesexitugesarijokijot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fd65cc-5490-467b-87e1-9b83529682f2/wipelivomeniguj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa79c651-12ab-4bdf-97e8-463154d2803d/93273198139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc978e6-3b2c-4d5e-a0ec-dd6407e571d1/17035753357.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_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 6108 bytes
SHA-256: c08a904a0580c2302dc5729494925975e385c593558924aa3abd3d19ea4b85b2
font_01_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 5256 bytes
SHA-256: 31033848629cd8faea54499e512db23f0ef53849584c92aa0b5ef900a660c33d
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10696 bytes
SHA-256: f44372f4cd0390b3944a3b95ecd3d8cfc1fc2bc8731381fad616e1f21ff66f04

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