Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f4ec74e2f8d239…

MALICIOUS

PDF

66.4 KB Created: 2020-11-24 18:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 940877b734b9870b58f3a9fba02ec5de SHA-1: 1659c9bdb167309fddf450731762c0c7414f871c SHA-256: c5f4ec74e2f8d2398dd8e31d8d6470f0f21aa2da1eafe40974d68bf74ddb2895
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits multiple indicators of malicious intent, including a critical heuristic firing for brand-impersonation credential phishing, specifically impersonating Gmail. It contains a mass external link farm, with one of the primary links pointing to a redirector that likely leads to a phishing page. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the overall structure suggest it's designed to lure users into clicking malicious links, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gebopudexor.weebly.com/uploads/1/3/4/4/134482947/6020d3a3fbb.pdf.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=using+similar+triangles+to+find+slope+worksheet PDF link annotation
    • https://gebopudexor.weebly.com/uploads/1/3/4/4/134482947/6020d3a3fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_5fbc8144d5beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fa362d81fda7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fb53461c2ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_5fa0c12bd4e9e.pdfIn PDF document text
    • https://pibepiramizenat.weebly.com/uploads/1/3/4/7/134735255/fa384a86d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_5fab6f5914b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f89c58348327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f93315d37de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f9a223900b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fa044b2cbb8c.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/7659371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fab6a05143c7.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/65af46de-e4bb-452b-b490-7e6f37fc5d21/resijojilajav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91dd7e99-f25b-4dd6-a1fc-828c7f492778/color_switch_challenge_100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1639e8e1-d2af-4c75-9d79-df78dbb98a51/jarusesivuwuzubeduzi.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_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 5604 bytes
SHA-256: 743ed07dd61bbedde72ec1592b48277a58f8ee4c9286760996ab7e39904a486e
font_01_sfnt_off0000d740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 10924 bytes
SHA-256: 3351eec1aedf65c5f4e117e40ff4e26eb8a72033e0479b904232d8176413ba79

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