Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddfd73df1793d84…

MALICIOUS

PDF

75.0 KB Created: 2021-03-25 23:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f47710bf8b63a66c9ff7399d35c974ac SHA-1: 6656404dd43f52b3ebf5cef1e645134bd63ca65c SHA-256: bddfd73df1793d847bda431e0fe4fe5c63a4a65e8f6d6bab410271fb09169285
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that likely lead to malicious content or phishing sites. The presence of external links and the PDF_SEO_LINK_FARM heuristic suggest an attempt to direct users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/123?utm_term=status+love+failure+song
    • https://latifaxegorur.weebly.com/uploads/1/3/5/4/135400737/4661049.pdf
    • https://cdn.sqhk.co/xorunase/ihqXrib/screen_time_mac_high_sierra.pdf
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/fulatusufubak.pdf
    • https://cdn.sqhk.co/fifusaji/jai5tic/bisabalozaganeregogore.pdf
    • https://dekilaroturiti.weebly.com/uploads/1/3/1/8/131856809/1836495.pdf
    • https://cdn.sqhk.co/votojuxosaf/hiQggJD/69336486249.pdf
    • https://cdn.sqhk.co/bexefoboxevi/ieAjeEU/face_changer_video_app_ios.pdf
    • https://gojulujowavid.weebly.com/uploads/1/3/4/8/134886085/8517726.pdf
    • https://sabexinutix.weebly.com/uploads/1/3/0/7/130740027/xisukotuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_183e933bf1464d1e9fae14293c85fc0d.pdf?index=true
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_efee83c8cac2408f8660ac33288d56c4.pdf?index=true
    • https://s3.amazonaws.com/fedufiporara/what_rating_is_starship_troopers.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_5434c5bb2eba4cf4ad19a8aad4986492.pdf?index=true
    • https://s3.amazonaws.com/xapota/xulaliludi.pdf
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_4060385cfb8348bda53b0fe304894e36.pdf?index=true
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_0806aa9c50cb4062a1bd1c8bd768de46.pdf?index=true
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_8aed1b8828bb49ca85998844b5631cca.pdf?index=true
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_6de98eaff5684c23ba20f36b4e093627.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_38d4e42c620f4b059af785c2af6a0c0b.pdf?index=true
    • https://s3.amazonaws.com/gotenukevepunin/student_acknowledgement_letter_for_project_report.pdf
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_22dee41b2e0743e6ae69556d5e258d7e.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e4.bin
2fabf067f8e6d341dafaf8527437835a47304c3811f74c507db9924d9f9aca02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E4 5096 bytes
font_01_sfnt_off0000fa4f.bin
de36b18fd49fcf224affbbd5433296b32848c9c10cba7740b272ae3b99b57e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10740 bytes

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