Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97d68ca38a1acfd…

MALICIOUS

PDF

74.2 KB Created: 2021-03-12 12:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 709f17ecd86452eb315c2e248fcd14b3 SHA-1: 4f3277cdee7d0455ad72547de696f922d11f0296 SHA-256: b97d68ca38a1acfd0e797e0ed192f0662e978359de0fe73c3fe9808825e2d360
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link pointing to a URL that appears to be part of a link farm designed to generate SEO traffic. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=cbse+class+11th+maths+book+pdf
    • http://nenonazuf.scienceontheweb.net/how_to_do_hesss_law.pdf
    • https://cdn-cms.f-static.net/uploads/4486365/normal_6027bacb7f639.pdf
    • https://cdn-cms.f-static.net/uploads/4466673/normal_5fd9305f262ed.pdf
    • http://tixesikixux.mygamesonline.org/fozutazitibugowo.pdf
    • https://vuterezupip.weebly.com/uploads/1/3/1/3/131380942/bakelufovobi.pdf
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/legobevixikani-papisuzodut-mijafezewal-repeziwiziruwib.pdf
    • https://mutapeninudit.weebly.com/uploads/1/3/2/7/132712174/xijaxanupero-fiwuba-vepate-fiberabowezob.pdf
    • http://tidirakozodawon.getenjoyment.net/bevesuvilojorazosetasodo.pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_6047b8b73a7a4.pdf
    • https://cdn-cms.f-static.net/uploads/4469831/normal_60289b9f4099c.pdf
    • https://cdn-cms.f-static.net/uploads/4421960/normal_600a65e562928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fawikinego.myartsonline.com/havana_piano_notes.pdf
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_34a2ded63b0946c397f4468fa5de7343.pdf?index=true
    • http://satogitexuvo.myartsonline.com/29503975382.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_b62674a8f12049809a743801d118af7e.pdf?index=true
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_40c44e02a6784bd59e37c84ee2094867.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_6a2cea58006e4b2f9c768c2c2d30fd1a.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_8f72e39ab19c48048a992182722753f1.pdf?index=true
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_8dae3e253374487d9eead46a73180b5e.pdf?index=true
    • http://gavawekib.myartsonline.com/shepherd_bushiri_books_free_download.pdf
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_90b7feb9db5143a592dcbdfca48731de.pdf?index=true
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_0e9f43d29fd14e8394976fb13eb72229.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_off0000e5f2.bin
e7209814b047c745377e35a75d93ac9f0e614011676dcfa3aa2bd6c94b8fd7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 5460 bytes
font_01_sfnt_off0000f861.bin
715ac011472d6fe6bd61bdeeac83b3ca23bbde80d0a3106c206ff8db87085e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 10380 bytes

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