Malicious PDF — malware analysis report

Static analysis result for SHA-256 b634215796e3663c…

MALICIOUS

PDF

77.2 KB Created: 2021-01-22 11:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e06b4d3e3a66537b81fb09c2267129ee SHA-1: 8ac45a8a779ec618e1be5fdf7e75998af1b294a1 SHA-256: b634215796e3663c8b118a5f7565a9c49c1fb94cc3bbcc13dc10bdeefd0e40dc
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The primary URL, https://jottigo.ru/123?utm_term=christmas+chronicles+cast+age, is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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=christmas+chronicles+cast+age PDF link annotation
    • https://site-1174816.mozfiles.com/files/1174816/nintendo_dsi_2008_games.pdfIn PDF document text
    • https://site-1175796.mozfiles.com/files/1175796/counter_terror_sniper_shoot_mod_apk_download.pdfIn PDF document text
    • https://site-1202168.mozfiles.com/files/1202168/asme_welding_code_section_9.pdfIn PDF document text
    • https://site-1196452.mozfiles.com/files/1196452/lirica_app_learn_languages_with_music.pdfIn PDF document text
    • https://site-1185570.mozfiles.com/files/1185570/cara_video_dari_pinterest.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/ij97ja6/mobile_grandfather_clock_repair_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415527/normal_5ff6810adf92e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fef60393062e.pdfIn PDF document text
    • https://site-1171498.mozfiles.com/files/1171498/siempre_tomando_en_cuenta_en_ingles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fcd74afec4f9.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/tarowelijolol-jozig-sogiwegasesi-sadixe.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/a5bbcd57232.pdfIn PDF document text
    • https://site-1171796.mozfiles.com/files/1171796/audi_a4_avant_2016_user_manual.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/sukeborobod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daporanil.epizy.com/pikox.pdfIn PDF document text
    • http://budunasetixap.epizy.com/javigu.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/comprehensive_report_card.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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 5116 bytes
SHA-256: 3f7e8c20a4559cb690345688bf91406b8e193bef76a99730352368a32e2b671f
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 11320 bytes
SHA-256: a1e1f01e3d2bf6ce6ddbd5c8018c5b8dce8feda069f5ec848ea7e68236472834

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