Malicious PDF — malware analysis report

Static analysis result for SHA-256 683c927af5bac2d0…

MALICIOUS

PDF

73.6 KB Created: 2020-12-15 08:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 32719d6344e170e889f3842f4643523a SHA-1: 7b962206748274f4737b616c9dea29cf7abc77d4 SHA-256: 683c927af5bac2d08f8d1ce135392c49cece032e3b68d54ce34fec81eec3139a
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 at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a chapter title, suggesting a phishing or social engineering pretext to drive users to malicious sites.

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://traffine.ru/123?utm_term=the+girl+from+the+other+side+si%25C3%25BAil+a+r%25C3%25BAn+chapter+36 In PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/7357958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5f911e0350c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5fa662f811d49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_5fa0fea7c409c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5f8d45268d4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_5fb9c811f0438.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/02365433-555b-44b2-8a96-fc3a69cb3143/4553805833.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13d0827a199023ab79d37/t/5fcae622da45e86cca98ad82/1607132709163/tinkling_definition_synonym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ada4fb-19c4-4889-88e4-e3b1d36c06b2/sentado_en_su_trono_acordes_ukulele.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e6b83dfdd95b60d5131d/t/5fc2d368cb3e0f5771adb2ce/1606603625591/zewedabinoduwawipitivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d04cf03-44f4-42dc-b686-b0874299d4e7/rumosiniwudig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1816b6f4-9c5a-4d35-b5cd-02589480a480/mudowubuxaxemixipum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42980e1c-958b-4de5-8d4c-6f4c983cee0d/xulotodelerad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed788d88-7443-424c-8d63-54018c7c39f3/nepalume.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_off0000c8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A0 5952 bytes
SHA-256: 9ba53071efd3e72bfe9a2a01ce0bc4ec826de51cb4ff02f37d828381b02fcda2
font_01_sfnt_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 10768 bytes
SHA-256: 44254842e15bb3e27b19f1aa4fa29c20af96156bd860e5463bc70e0deeda6a40
font_02_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 16172 bytes
SHA-256: e023ef9f37ebb9498de13bbf522a52ae91458c70e54f9d640a5f4756df54a3a9

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