Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe9979528eeebff…

MALICIOUS

PDF

81.8 KB Created: 2021-02-14 15:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c5808ce8566eb0783ea2de5bf288d4c7 SHA-1: 95dab34d65bac270a8bebe51c38ccd46441a6d09 SHA-256: dbe9979528eeebff93217d85792560c2f15ef954ecad4d1f484a9c6177063841
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains and Weebly/S3 hosted PDFs. This suggests a link farm or phishing campaign designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://bologen.ru/123?utm_term=ghostbusters+google+docs+movie PDF link annotation
    • https://xowavexinoj.weebly.com/uploads/1/3/1/4/131408618/6637597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5fed6c35e97da.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/437e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ff66d8339142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_601728418b1e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fd8f882aa912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450884/normal_5febeb020656c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5ffa6ea800a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5fee3218753b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_601d3e513d035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5fd08fe755b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472198/normal_600362ec1f885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_601042b735e29.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/jedaxopopuko/authorised_letter_format_for_gst.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/aerial_fiber_optic_cable_installation_guide.pdfIn PDF document text
    • http://gobofitis.epizy.com/aumentativos_e_diminutivos.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/elsa_speak_pro_apk_cracked.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 5376 bytes
SHA-256: 9be1bc6cfae922071b6582ac1142a9475c0baf75e80df548997112dfe91e2d4d
font_01_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10588 bytes
SHA-256: 7d379109aa81beb0e467d783d1251da72429d209d35831f65edb77ad1ac689c1
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 16244 bytes
SHA-256: 37bd064822a4139c5d8e3cdb2e2dd8d0ae9d956962f76839c9edaf1267f3d3f3

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