Malicious PDF — malware analysis report

Static analysis result for SHA-256 623fe576a9b5999b…

MALICIOUS

PDF

69.5 KB Created: 2020-12-04 18:46:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 54cc47a1ed62398f52fd550399944a14 SHA-1: 9474ae6eb16682244613ae0cda481c2ff8ed9501 SHA-256: 623fe576a9b5999bd62330ff9c7bf1dd87653f065bfff5dd25b0e2852179ad3b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to potentially malicious sites or engage in phishing. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or malware distribution campaign.

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/strik?utm_term=osu+ccs+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392451/normal_5f9194a9bc792.pdfIn PDF document text
    • https://gazuxajolitivik.weebly.com/uploads/1/3/4/7/134770387/bosovur_towudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fa5f55f94de7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b85a7f7c-b2b7-4f40-a7ba-1b1de90b6837/kugesawovepekizaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba29c383-6eb5-4559-82df-7d5d03f0f31b/parametric_equation_of_a_semicircle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de3ae06-4d00-4949-87a9-cd8e7c39173f/shoei_neotec_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/runiwukagupikakizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0909368-303e-4b78-8610-54ea990c7c60/52567781103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2cea18-c101-4026-a104-8e5943d7364c/diseo_de_intercambiadores_de_calor_de_coraza_y_tubos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165c000f-c485-485d-8c0d-5c20e11f0257/power_of_faerun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfb2312cf09257bd651d14/t/5fc3bd7418e72e5fdb4a07e7/1606663540547/gene_keys_golden_path.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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 4248 bytes
SHA-256: 86061dc4b4eceb14a1b48a3c22fe1e6e4d298756041c881dae59d458b87b2f03
font_01_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10548 bytes
SHA-256: 503235e3ad17c14c8927b7359d052b00f1df9dbb613b83d0b870a69cdb479941
font_02_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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