Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19b6393cd87527c…

MALICIOUS

PDF

76.1 KB Created: 2021-03-14 01:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 78439ebd26c635554a6159b4ce011915 SHA-1: 5a12f731b573fb32939fff21a738876a19a563a6 SHA-256: e19b6393cd87527c3591c399ff79c96fae28950184a2c164f5a5851f77a4c637
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified 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 or SEO spam operation. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://leonvi.ru/award?keyword=autodwg+to+pdf+converter+full PDF link annotation
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/panodakuzoz-jotemetisadab-vonureb-ropewezosodemaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418368/normal_60198fb950e18.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/tamed.pdfIn PDF document text
    • http://thrivewebs.com/redebojafozipanapap49w.pdfIn PDF document text
    • http://hallhq.xyz/31007361888qlvtz.pdfIn PDF document text
    • http://zexuxavar.iblogger.org/ccny_academic_calendar_fall_2020.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/vopanaf.pdfIn PDF document text
    • http://power-guard.shop/romojerujupulexofyoxit.pdfIn PDF document text
    • http://vehicleusains.com/120473112040qmp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408881/normal_5fc61d885ab22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_60490c89705e1.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/6757608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5fd6a91fc49f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojefujal.rf.gd/81321147621.pdfIn PDF document text
    • http://desebavufix.rf.gd/canon_elura_100_sd_card_size.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_ee1a7f9379934f87813a3abf3455936f.pdf?index=trueIn PDF document text
    • http://dinopug.epizy.com/95264228347.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_700a0235836a47699556ac60e900dc90.pdf?index=trueIn PDF document text
    • http://kasojazosejona.epizy.com/12988543084.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_da2999721bdf40f7bf36b8716ccadc2a.pdf?index=trueIn PDF document text
    • http://rodujuvutadaxam.epizy.com/balloons_birthday_vector_free.pdfIn PDF document text
    • http://momugegunimex.rf.gd/download_divergent_subtitle_indonesia.pdfIn PDF document text
    • http://zekubegem.epizy.com/delivifexotejevego.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_9f81058291be4f3c933dfb9386e22f58.pdf?index=trueIn PDF document text
    • http://golokelu.rf.gd/wasowewetugamenanap.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_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 5076 bytes
SHA-256: 58b18794aa05c4d55ad92cf484ea6b3e2fc7db7db2766063a26158b87bef33e6
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 13792 bytes
SHA-256: d96094830c11869178bf1686e50da434315e6c68341e930684fe62cb4475143e

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