Malicious PDF — malware analysis report

Static analysis result for SHA-256 994dc06b14253feb…

MALICIOUS

PDF

69.0 KB Created: 2020-12-06 00:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e3f9477f341a795e5454d4ae7fa4142c SHA-1: 72ff9faa0412c09fc49a784ead5e3803c46d8956 SHA-256: 994dc06b14253feb5be9953b5e799ff8df322de036b175802fbb9ac04253216c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary malicious URL identified is 'https://traffking.ru/123?utm_term=gramercy+arts+high+school+ceeb+code', which is likely used to redirect users to further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffking.ru/123?utm_term=gramercy+arts+high+school+ceeb+code In PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/kelepevejufizug.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/12025b2d64ef6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5066e104edf1d779b9afc/t/5fc9145e2a530c5aaef616d3/1607013470806/51366999923.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c07f92c50b1a1e98aee2/t/5fcb8ff1393ce47356358bcf/1607176178137/30376522794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0db4b08-91a7-4ef0-93b0-4dd92a298bce/xbox_games_iso_burn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8397eba-db00-44b1-bc0b-be7cdf37f5a9/66836174564.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e081be9b6939510aa493/t/5fc558884e98326c02c3721a/1606768778490/ralogapebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96451aec-19a2-4b0d-94fc-87cc9c11a49d/gapifigoxunekak.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4ef12dd96f5918e5286a/1606373105804/86822983748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6145eb49-0c4f-4f5c-b4c8-574ca091cac5/91289526427.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00874a5bc066edfa0f7a0/t/5fc2a59feaf37e3b64f33fa2/1606591903359/catharine_bell_nude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf47d1b-8e09-4ba5-ada6-cdb253dfee4b/pizz_party_pickup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65351ab79f442f24e7764/t/5fc9602c583b2c5781ecad3e/1607032877596/car_driving_simulator_mod_apk_for_pc.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_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 5624 bytes
SHA-256: 515a1c6cb61507bd7bdcb1e44f7fd8c3657844bf9856518f3356430652b440e1
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 10648 bytes
SHA-256: cfaecf780b946fdcaa7ff3d6e524eb9de69bfb60d3d7d55bb1e317a28de47554

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