Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bf8f3ea65df984…

MALICIOUS

PDF

74.8 KB Created: 2021-02-20 19:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 30f79ca43a46e3397fda1ea2e4596c56 SHA-1: 2dab647e2f8d5f469aab0045fef25b3dac0ae797 SHA-256: c0bf8f3ea65df98414037f38fa7279d82cb3f839167dcc16eba9c634c07cd3d0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/wix?keyword=precalculus+final+review+with+answers PDF link annotation
    • http://nutigunejome.22web.org/lords_mobile_guide_resources.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_5fdbfdab0c08c.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/ramewoturiwadak.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/iahdgjB/rumble_strips_make_music.pdfIn PDF document text
    • https://zebazefapik.weebly.com/uploads/1/3/1/3/131383848/806e2.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/jbtztHf/23301415385.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/IqxEgcc/pottery_barn_baby_furniture_reviews.pdfIn PDF document text
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/melekikunokapomopi.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/hiGyof3/10206669922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_6030dec74729f.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/9595ff024.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/fjc8KLx/paint_color_color_by_number_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liboditi.rf.gd/endnote_apa_template.pdfIn PDF document text
    • http://fodarevo.rf.gd/hungry_shark_evolution_mod_apk_hack_ios.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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5120 bytes
SHA-256: 011568288cc6547b4fc33983757ee2e7907899ab36a2992c7b09bffe772bd1cd
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10476 bytes
SHA-256: 95238b599d101ea93a73b58c9ddeec82e0d469229a50d61b866f8c0513b4f321

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