Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0d408fe5ecfe27…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 11:21:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 079e33d063c9c0947c611a92a0d09fe0 SHA-1: 002779b5f957831f131c381c8c5afc289ce396b5 SHA-256: 9e0d408fe5ecfe276e4d885a61e8631a98e1b4e703124e14251dd1062b091dad
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, with one specifically appearing as a search result for 'what is the lightest element on the periodic table', suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to host many links, likely for SEO manipulation or to distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=what+is+the+lightest+element+on+the+periodic+table PDF link annotation
    • http://afracheat7.xyz/95142952734go6h9.pdfIn PDF document text
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/27c89b3294c.pdfIn PDF document text
    • http://rabusog.22web.org/b._ei._ed_full_form.pdfIn PDF document text
    • http://revinulamuxawa.22web.org/assignment_front_page_design.pdfIn PDF document text
    • http://bubiwikozexamo.iblogger.org/lixo_organico_e_inorganico.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/67dbaa7b9e.pdfIn PDF document text
    • http://bigtittybella.com/curso_online_sistemas_de_informacion_geografica3114b.pdfIn PDF document text
    • http://liketsven.xyz/faganabi5wllg.pdfIn PDF document text
    • http://drive4mclaneaustell.com/18389144857io80l.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/4929319.pdfIn PDF document text
    • http://look-hotel.com/23191162752c01u7.pdfIn PDF document text
    • http://dutov.org/base64_string_file_format027me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mavugivedib.rf.gd/brazilian_portuguese_verbs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/java_1._6._0_archive.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/what_lawyer_jobs_are_in_demand.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_7247cacfd7dd404587fe31dd1d906b13.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_1923dd17eac24f2f9f6d7aabcf836e72.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_9cb4be28108748f19a2cc781f2a93641.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_26208e57f86d440a9863f2f2f7bc4ffb.pdf?index=trueIn PDF document text
    • http://gadirojata.rf.gd/90014020657.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_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 5640 bytes
SHA-256: 99e265932248c49f8da8b88046681ac501741be6ff2ff82f8e50d8ddca1b5715
font_01_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 10868 bytes
SHA-256: 719ef969e738a2b688f1231990c1927251152180aa4d521eefbce32f1593bab1

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