Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5eed0661dd51a0…

MALICIOUS

PDF

78.0 KB Created: 2021-06-04 12:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fe85b06e2a9b0911dbef243cb74dac52 SHA-1: daea63e4498de10e4b265c5fa72ed17f2c67b49b SHA-256: 3f5eed0661dd51a0592ce0b2cc5f3a3d6bfc207a04a253e3d954c10a30c653cd
214 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains a mass of external links, many pointing to disposable hosting, and one specific URL is used as a redirector with a 'utm_term' parameter suggesting tracking. The document body, though heavily obfuscated, appears to be a lure related to installing Android on a Kindle Fire, combined with metadata from wkhtmltopdf. The presence of numerous external links and the ML classifier's high confidence score indicate a deliberate attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/pbw?utm_term=install+android+on+kindle+fire+7th+generation PDF link annotation
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/4157845.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/d32896ee5.pdfIn PDF document text
    • https://vabiganivasekeb.weebly.com/uploads/1/3/4/3/134339064/094629.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/00415a4a-e9d2-4049-801c-9812919c26e5/212_degrees_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d268c12a-0805-4b2c-90d2-b8ceb52af33f/why_is_rehabilitation_better_than_punishment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023f524d-52f8-47cb-bb02-92e02a5e547d/pejizatefiz.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/zajac_s_jantrovmi_oami_netsuke_commands.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/w/file/fetch/144599412/how_do_i_manually_update_my_old_kindle.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144589398/9596287879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46d22e7-c91b-41dd-befa-130da7199a23/mamiya_rz_lenses_review.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/do_you_have_to_bake_sculpey_clay.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/67482357965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a282ac2c-c33c-46b0-b29d-445304d742b2/football_coaching_session_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dc73de-edae-4220-a7f9-df692b06bd2f/sepiwenigow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a2f30b-d5aa-4096-80f8-77a7be96d3ed/tajepeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31451eb-5853-4ce0-94ea-11156145b875/tower_defense_simulator_nuclear_fallen_king_music_id.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/43640709759.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/kobipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff32cd41-5a33-4790-9489-4dffa074d3d1/68471924102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd7fcb7-a067-4488-9162-842e5c9422ea/52795926154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4283e6-966b-4642-bef4-94fdb45d5b21/84764566019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd888d74-0674-4d92-92dc-253340aac7d4/lezinasokejajegad.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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5252 bytes
SHA-256: bb2a990b6c16d16e3a09b1bb8b29308c521d438df38dbb00f27014e1339736ee
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 11692 bytes
SHA-256: c45c71f20f7cec42d717396aa9a8eec220fa2126b467969e35e92041b22ff024

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