Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf9e08817d9dff9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-16 02:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62bbaa297489b835eaa7e4492fd2e69 SHA-1: 1f9d1426e9123807e3ac52e261d281f61014c65e SHA-256: ebf9e08817d9dff90ca8f9ae96b06058fab1e4acc359a9106211c47c6d99174b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm or SEO manipulation scheme. ClamAV and ML classifiers identify this PDF as malicious, specifically a phishing or trojan variant. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious activity under the guise of educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/wix?keyword=macbeth+final+test+review+answers
    • http://xilagima.66ghz.com/lean_process_flow_chart_template.pdf
    • http://ritual-venki.online/beresfh7s3.pdf
    • http://izzzaaa.space/exsultate_justi_john_williams_sheet_musicrp49q.pdf
    • http://prosucre.pro/86845523500hlynu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/58ef75fa-a97b-4537-a6a4-b64a63175cd5/sonijiwujolim.pdf
    • https://uploads.strikinglycdn.com/files/8b09159d-28e1-4709-bffb-188f6bf96b81/best_non_slip_resistance_bands_for_glutes.pdf
    • https://s3.amazonaws.com/somisilegex/53984089516.pdf
    • https://s3.amazonaws.com/kozewuposoridil/punjab_benevolent_fund_form_2019.pdf
    • https://uploads.strikinglycdn.com/files/7b81b7ce-daa1-4e85-8aec-cbd9f7c07396/51717784696.pdf
    • https://uploads.strikinglycdn.com/files/b16b24e9-2823-4286-af66-32e0afa88585/48547292680.pdf
    • https://uploads.strikinglycdn.com/files/b2044fd4-9268-4d04-90ea-45538a9227e4/20109707720.pdf
    • https://s3.amazonaws.com/wusone/acc_guidelines_antiarrhythmic_drugs.pdf
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_114390e6bff0487385af60ddb2cf739a.pdf?index=true
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_2895821a6f534ff991d5d8b336a518ab.pdf?index=true
    • http://velevemi.epizy.com/boris_cyrulnik_livres_gratuit.pdf
    • https://s3.amazonaws.com/febopa/how_to_make_toshiba_dvd_player_region_free.pdf
    • https://s3.amazonaws.com/kavalukato/fexatakadogasadisi.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/how_to_cut_box_joints_with_a_router_table.pdf
    • 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_off0000ecdf.bin
e3710785d805538367ceca36160f557b9c12d3c25b5e2367a6e27fc550a7223a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 5268 bytes
font_01_sfnt_off0000fee4.bin
3b174132556c6160fdd25fabcbc25aa031b10fc632ffa68f008e92f3659684b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 10652 bytes

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