Malicious PDF — malware analysis report

Static analysis result for SHA-256 80aab1add7afb03b…

MALICIOUS

PDF

81.8 KB Created: 2021-04-05 06:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bb6c728a39234afe5ab143114419836 SHA-1: 69adca59bdad2fa5ac98b8b327a5007ee4056b08 SHA-256: 80aab1add7afb03b475f328b724cc2746f5b9fbd5a818179b4d669ac68eaf857
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://ponafet.ru/wix?keyword=tipos+de+suelo+en+mexico+fao
    • http://duplicwcnj.space/tiwigulapakukqu6x.pdf
    • http://serdyukov.pro/film_nancy_drew_and_the_hidden_staircase_online_subtitratfoi9o.pdf
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/dd8a68435.pdf
    • http://fakoxipedobuk.22web.org/hp_laserjet_4200_series_driver_download.pdf
    • https://cdn-cms.f-static.net/uploads/4463300/normal_602432fee1ad4.pdf
    • https://gunobodupisar.weebly.com/uploads/1/3/4/6/134677737/ludaxef-milivozo.pdf
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/wadawimeral-niwida-wolepiwugode.pdf
    • https://cdn-cms.f-static.net/uploads/4381735/normal_605fa3f0938fc.pdf
    • https://static.s123-cdn-static.com/uploads/4402963/normal_5ff86fa01aeb8.pdf
    • https://jaxevilin.weebly.com/uploads/1/3/1/6/131606955/8e567.pdf
    • http://drilltech.info/99331835020ql6wp.pdf
    • https://cdn-cms.f-static.net/uploads/4379616/normal_6030304ef11df.pdf
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5ff8c1bb1fa6a.pdf
    • http://goldstein.berlin/ecommerce_startup_business_planlmvke.pdf
    • http://mojadejazisapa.sportsontheweb.net/vegawukuzilesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_9d6cf4f8dbec46b58442d03ebfd748b5.pdf?index=true
    • https://dd54f144-242a-4a88-9385-6c39f9996aab.filesusr.com/ugd/9f32c1_dee2ed55aaa14c90993af1cf7d5d3898.pdf?index=true
    • http://vigexosav.myartsonline.com/near_infrared_spectroscopy_principles_instruments_applications_free.pdf
    • http://zevesijuduma.atwebpages.com/mufupufukalafopenunik.pdf
    • http://zixagoku.rf.gd/22949157581.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_4dc1a005279b4203b4d82702e32a9ddc.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_off00010077.bin
8ef90e887fcd54f4e23cb25dc38a738b50c933a49f89cc247a23139d47cd8962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 5220 bytes
font_01_sfnt_off00011231.bin
d1ccd1e02ebdaf3647d258f14ff93cf5eeaa711519f5b9bea68fbf242a5727a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 11756 bytes

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