Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6166b7b8ffe807…

MALICIOUS

PDF

72.3 KB Created: 2021-01-06 15:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bdb107e675494f59c233b02278da1fbf SHA-1: d4f5fa813d71d8b05d672493767f5949bc91d927 SHA-256: cf6166b7b8ffe807e2581d9619a491fe06816b3c43a5c8df1e6da02a45c909ac
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the embedded URLs, 'https://trafffe.ru/123?utm_term=catch+the+moon+questions+and+answers', is flagged as suspicious. The ML classifier and ClamAV also indicate maliciousness, suggesting the document is designed to redirect users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=catch+the+moon+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5fd281d862a47.pdfIn PDF document text
    • https://notokawuwo.weebly.com/uploads/1/3/4/8/134856920/245f75a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fe82da086646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5fae63ae2121c.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/fc4f8224-a89d-43e6-9e52-efe9ab3bd252/natural_selection_vs_artificial_selection_venn_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8f3c99-c068-4dde-94b3-748c8a4c880b/sonodawimilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87427fa7-b235-4891-9fd1-dcb5512cc7f9/sikegetisozax.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/buvunokudim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736207c3-aacb-4860-afbd-9e64d98ffd34/55818158920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879a4ab3-9c0f-4755-87be-7fb5d34fe599/co2_car_designs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccd34ba-017d-4470-b605-f43ddabe36b1/femomenisemev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83080840-aa1b-4d1f-98dc-f3995c4a2b8f/liziwekatiximafogizuz.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/manuale_scratch_italiano.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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 5272 bytes
SHA-256: 094463196cff2c751d4557000468155b5ceabee22f3da50f8589e7dc040a5cbc
font_01_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 10688 bytes
SHA-256: f5850b409bfc98254481be3fb3e0e3015498bf458bf423746d3e7a6ba79db976

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