Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0686de1239493b…

MALICIOUS

PDF

73.8 KB Created: 2020-11-18 07:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68473df8dca53e57f25b0439ce8363fb SHA-1: b3e60ea9a52f80a7e7f6caf827f1c1b1a1151d43 SHA-256: 5b0686de1239493bb8f262d1b4393886988f0be2b7b599dbee180d2b53e8b9e6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being detected as a phishing trojan. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=how+did+robert+dudley+die
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/samesuseliju.pdf
    • https://liguroxuf.weebly.com/uploads/1/3/4/4/134443360/kutojesori.pdf
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f973ae13dcd3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tezofuretejom/libro_el_bestiario.pdf
    • https://s3.amazonaws.com/matogapibelifiv/21908615653.pdf
    • https://s3.amazonaws.com/wonoti/bitibepikuvovuzile.pdf
    • https://s3.amazonaws.com/paxivogedewilu/regum.pdf
    • https://s3.amazonaws.com/mokuwanibof/add_the_standard_keyboard_layout_windows_10.pdf
    • https://s3.amazonaws.com/lulelepese/capitu_livro_em.pdf
    • https://uploads.strikinglycdn.com/files/5783ba8e-4258-4166-a23c-8a8e6f2f9dee/58035388735.pdf
    • https://s3.amazonaws.com/baxekojojexusol/agradecimientos_de_tesis_ejemplos.pdf
    • https://s3.amazonaws.com/rujabepifar/duwogak.pdf
    • https://s3.amazonaws.com/besafefaf/fefiniposegerezag.pdf
    • https://s3.amazonaws.com/defujo/59977560196.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c6.bin
65fb8bc7151283bb26255bec3bb32a123e06aa8b35aab3d9f0e82c3c71eda4aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 4504 bytes
font_01_sfnt_off0000e93f.bin
53762a850d68b1db8653bd0b7b418e44e482b05d461d605fbdfbd2338bc612f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 10364 bytes
font_02_sfnt_off00010c70.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C70 4324 bytes