Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a5583d2c8689d1…

MALICIOUS

PDF

83.0 KB Created: 2021-01-01 19:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 00ac9724b74422cffba7892bb0f61b84 SHA-1: 939815a2fd1a188d02897ab9b8aebe953b641375 SHA-256: a0a5583d2c8689d1758eca24c899b86698388aa94fd8d74a1f5bf62d90fd715f
156 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 external links, identified as a PDF link farm, suggesting an attempt to manipulate search engine rankings or direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or spam. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • 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.
  • 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://traffine.ru/123?utm_term=moultrie+model+mcg+12589+manual PDF link annotation
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/janedaxo.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/b3b0a7b7-7623-4970-ac3e-3a55f68ff51f/puretadovisejagu.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/25461127401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6939692-ce28-4ee7-ae51-3d70b99a7a8a/boxukixotizinomebemala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4dffc7-92a5-4212-a6e5-233950a4ff2c/narupelebid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6336771-a845-48f6-adde-0208e8584968/75686319950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e430fc49-f1c5-4d4c-8839-31e0e58e6e20/alexandria_high_school_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47366b2-ba94-43f2-a1b2-55a7bd9b7202/fumabutesizutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231fafa6-6cff-471f-a66d-27e0162b0327/72676321486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7c2e52-3a34-4fc4-8807-a8fb9c443a05/55632407028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09ca712-8590-497a-82f5-aa06c573d9a3/how_to_hack_egg_inc_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0e433a-d2cf-41c1-ac5b-3922c85e1fb8/97233618675.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_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 5744 bytes
SHA-256: 5aebb71a7890b1219ebe61ba6fb77bcb8513d1cbf90f3711f0a926691b398200
font_01_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 2324 bytes
SHA-256: 4a4311593666fffcffcf80423367ee14a7d758c68978967b309794501dab07b8
font_02_sfnt_off0001150e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150E 12132 bytes
SHA-256: e2ea0f847488b0cc4952c01104238516e64579aad6fb2f971d84d3607d5588d4

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