Malicious PDF — malware analysis report

Static analysis result for SHA-256 916de11c7388fd2c…

MALICIOUS

PDF

99.9 KB Created: 2021-04-01 00:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 349850d8ae93c4f150b33d8087239038 SHA-1: 5fe175d84a17f190ef18dbc01c594b5886f479bb SHA-256: 916de11c7388fd2c1f1f9227c500c7780716c82edced5ad31398cbf3f6e5e287
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains. The primary URL, 'https://soxebez.ru/wix?keyword=realidades+2+capitulo+4a+prueba+answers', suggests a lure related to educational content to redirect users to a malicious site. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wix?keyword=realidades+2+capitulo+4a+prueba+answers
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5fe9b8784c1e0.pdf
    • http://lezirumari.sportsontheweb.net/agrippa_three_books.pdf
    • https://cdn-cms.f-static.net/uploads/4461763/normal_60247b95b9632.pdf
    • https://cdn-cms.f-static.net/uploads/4454550/normal_60445b500eab9.pdf
    • http://jetinaxisodew.mypressonline.com/pusexudaniso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6c592f23-0891-4215-a65c-d96b9b4e816b/is_cyberpunk_2077_on_pc.pdf
    • https://uploads.strikinglycdn.com/files/b871821e-7b1e-492c-950d-882d367a7bdc/apc_be550g-uk_back-ups_550va.pdf
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_48e693c8de7041d3a505695bb81f6d9d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c603ce3e-38d6-4096-8be9-76cb5f4c79ea/dabubujebegaxosexoburofu.pdf
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_5627b01a910c436f8681018dfd6d1086.pdf?index=true
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_77a4eb1ed2104bcab73924e5f6b59477.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_e4b5a036901947f99f3f5a15d96678b7.pdf?index=true
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_3c2880eb850541c1a33a2ad610e04d27.pdf?index=true
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_365f29d244e046bea9c602ff10e6cc90.pdf?index=true
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_3e54f4fcccb146ccb5caf7ab0d25cf69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81f1730e-a6ab-4a0f-b23d-6af2c217afb8/pisik.pdf
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_392669f677e142a386609e3bc0d8e144.pdf?index=true
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_527b837944bb4ba69a6b46f8e95252da.pdf?index=true
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_7cc2acdf36234269805510cf85dc0543.pdf?index=true
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_28a44f298c7d498e84bc43981f2a6cca.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001376f.bin
945b83e00db913d65fa327b9e5c7d9b7c4929d74857f8d2883ba0fb254158319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 5408 bytes
font_01_sfnt_off000149ee.bin
84a1f16ac8be6f732f332f2c307dbd5479abc4b72adddb11d29b50554daa8116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149EE 12848 bytes
font_02_sfnt_off0001737f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1737F 4324 bytes

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