Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad4f70b34dd13ca…

MALICIOUS

PDF

76.0 KB Created: 2021-03-18 08:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 84d04a398edbca3d229322d3bc12a70e SHA-1: 9b857fbe2be734d0e89224dab10fc7446f7cdd71 SHA-256: 9ad4f70b34dd13cae664e9ac204d6406f0e079d896dac1f6ea99c26cb7ebc439
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://mezovuduw.ru/wix?keyword=formato+de+celdas+en+excel+numero PDF link annotation
    • https://volatofe.weebly.com/uploads/1/3/4/4/134442598/wanakilud.pdfIn PDF document text
    • http://bokexetukesu.iblogger.org/2005_honda_odyssey_sliding_door_not_closing.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/lipusamexupa.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/kumukukelorepifatul.pdfIn PDF document text
    • http://felejus.iblogger.org/perat.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/genozoxe-jilinunav-jozibise-muwazozikogen.pdfIn PDF document text
    • https://nodefosodetapa.weebly.com/uploads/1/3/5/9/135978328/54543ab8a.pdfIn PDF document text
    • http://pusapev.scienceontheweb.net/word_family_list.pdfIn PDF document text
    • https://rejezulibege.weebly.com/uploads/1/3/4/0/134018585/wadadokex-kedamugolob-vizuzifukov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maxajufabes.epizy.com/tetumet.pdfIn PDF document text
    • http://bakajejupuxa.epizy.com/6049152526.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/95083726400.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/75945580303.pdfIn PDF document text
    • http://tegumebedizeso.epizy.com/16925478016.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/national_cancer_information_center.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/google_chrome_browser_for_windows_10.pdfIn PDF document text
    • http://pogebikaku.epizy.com/6078264463.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_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 5108 bytes
SHA-256: 249ffff4797e225a67565878741f25bf08ad494112ad99c0d700e99a0cf1ea22
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 11320 bytes
SHA-256: a00f07eaa29630b5c24a6c7814553fd7fb3df010cf0f25a424d6a2dac57d7f39

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