Malicious PDF — malware analysis report

Static analysis result for SHA-256 b327588d4b3161e9…

MALICIOUS

PDF

64.4 KB Created: 2020-12-17 01:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a0b78bf8ad920482e24194193a4a2e95 SHA-1: 8ef890b85785892e102e2fc9b053dd0c7dce6501 SHA-256: b327588d4b3161e9814666188c7188b450fdb0f963e37300699f6253ffc4cbad
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm designed to manipulate search engine rankings or redirect users to malicious content. The primary URL identified, 'https://gettraff.ru/strik?utm_term=convertir+1+5%252F8+pulgadas+a+milimetros', is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=convertir+1+5%252F8+pulgadas+a+milimetros In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fad9b6de4e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_5fb39ace9e1d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_5fb2980f99ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5f915ddf5f4e6.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/nunev.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/foruzejewogabusolafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5fc5234b405cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8f04db5000d.pdfIn PDF document text
    • https://vokugovu.weebly.com/uploads/1/3/4/5/134598923/8674592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5fcaf906d45d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb79e5c7695ca99bb922/t/5fc2588ee18c5c478e47e4fc/1606572174451/weramerego.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10ac260f2895dc1e8a19d/t/5fce94fdf4ca26594fc3d73b/1607374079041/silicon_valley_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4160f3-0d8a-4725-a3f4-6c9e7821cff8/vigemitukafapebofoz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5db4db8467722f1f5c10b/t/5fd02bab06d21916ed643c4f/1607478187897/assassin_s_creed_identity_apk_for_android_kitkat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4e584f98375720d6b765/1606372952952/eli_computer_guy_voip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a6f557-f02b-4e7b-91f1-152127cfb2b5/menitituz.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_off0000bc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC75 5652 bytes
SHA-256: 61f8d20ddc4da9e9f37b748152669bc0cb8d5d5dabe867f281f3074f65e85158
font_01_sfnt_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 10668 bytes
SHA-256: 32ce04f8b31a2ac5b04f281bec5995516fb567d942b079a8344585b06f02513c

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