Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41484410157d118…

MALICIOUS

PDF

77.3 KB Created: 2021-03-27 18:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d0322f6f33cbb06194b3f01c3111a9 SHA-1: d1606f2fa18d532d56d6badb7af04d9225e5c0f4 SHA-256: d41484410157d118dca9e5e0fb281b43fdac2e03bc2f636f08a2fb558944348b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to benign-looking files, but one primary URL is suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=evaluate+the+arithmetic+series+worksheet+answers
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/0ce377cc9d4bd.pdf
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/7603977.pdf
    • https://ripegedabezigiz.weebly.com/uploads/1/3/2/6/132695689/79d2d7333e3eb70.pdf
    • https://nazaxefuv.weebly.com/uploads/1/3/4/5/134589683/dokixi.pdf
    • https://najafisexu.weebly.com/uploads/1/3/5/3/135330693/tubawumurebod.pdf
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/beb9d0a8.pdf
    • https://zugowexilib.weebly.com/uploads/1/3/5/3/135349829/gasevofutawudiwoteti.pdf
    • https://latesadujogoxov.weebly.com/uploads/1/3/1/6/131607544/dunig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_75532fe775af46eea160d2f471b33663.pdf?index=true
    • https://s3.amazonaws.com/dugibabafod/games_bus_simulator_2015.pdf
    • https://s3.amazonaws.com/fajeloninesitel/canva_premium_apk_for_android.pdf
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_6a9ea62fe0da474c8debae5370d9b6d4.pdf?index=true
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_97dc9160d3f04ce59d0bcf093b19714c.pdf?index=true
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_2a13924d2d0f4688a399d14862c68033.pdf?index=true
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_a70c19f1225c48e59ee224d2e9b30393.pdf?index=true
    • https://s3.amazonaws.com/jedadokuti/what_is_immanuel_kant_best_known_for.pdf
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_a53c51518f4c46498789976dea9a0938.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_1a29c0c7e05e4319982f52b435d24892.pdf?index=true
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_4be9eca9f09b4a2faf6b09a206e4c39c.pdf?index=true
    • https://s3.amazonaws.com/tanikanaw/bob_2011_revolution_se_stroller_manual.pdf
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_f6c68e5c85dc4e7dbbc1715b3af06055.pdf?index=true
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_a43036349aea4825aaae01cf2e860973.pdf?index=true
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_424db06dde924973a3078e1c0addea70.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_off0000ef49.bin
870139fe30cf6f35c5bc20b69056af41fb003532b891e3d7e2bd90fee9ea479d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 5212 bytes
font_01_sfnt_off000100ed.bin
db3131ffae6cf3171024ba16273c090baae2e2bece27896dac6d88d99c59ac1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 11312 bytes

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