Malicious PDF — malware analysis report

Static analysis result for SHA-256 043fb7123e56ec94…

MALICIOUS

PDF

69.3 KB Created: 2020-12-29 23:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7a5a013ac1a60130e512f4ff9a78461 SHA-1: f7b8e0aab3fb1e190789c6095c1fc2aebc765a9f SHA-256: 043fb7123e56ec945b6fdfe8cbffe0f2049080341576d87ddbbcfbed720324be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to external sites, likely for further exploitation or credential harvesting.

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
  • 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://trafftec.ru/strik?utm_term=international+space+station+pictures+of+earth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462688/normal_5fd897328f329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_5fd6dc2194a3a.pdfIn PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/1b60305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanalovum/77485410769.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/jamejalibifozidowa.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/innovate_3d_cad_file.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/95397139584.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/riwakanobo.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/45466099252.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/fabric_softener_stains_on_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/graphic_design_app.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/locating_epicenter_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/household_budgeting_spreadsheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/27127006506.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/hepatorenal_syndrome_guidelines_2017.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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 5040 bytes
SHA-256: 19600e120e3f6e7e00e77f1946b8b8aab85e6f69f734fd80c7a940180150f9d3
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10968 bytes
SHA-256: c6a7d502031f13b0187f75be857bf956e35109146fe3a3a94b7759d0ccd825bb

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