Malicious PDF — malware analysis report

Static analysis result for SHA-256 249ba9178f070f55…

MALICIOUS

PDF

77.8 KB Created: 2021-05-14 10:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dac890bc310610f4fc35bd428e8f63a8 SHA-1: 228ad2039a954ba7c57d5ea97c63e03bb991d9db SHA-256: 249ba9178f070f550d3cd7a9dbeb8ae5d27052bf037b56a271413e09c0c04c6c
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the overall structure indicate a phishing or malicious redirection attempt.

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://maypoin.ru/strik?utm_term=warcraft+3+custom+races+naga
    • https://cdn-cms.f-static.net/uploads/4453720/normal_6019fa6d598e7.pdf
    • https://cdn-cms.f-static.net/uploads/4454436/normal_60380649ccebe.pdf
    • http://dumubemajizukov.medianewsonline.com/78148292778.pdf
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6033effac8bb9.pdf
    • https://cdn-cms.f-static.net/uploads/4503214/normal_605b239737a43.pdf
    • http://nomudepalak.medianewsonline.com/feelings_and_emotions_worksheets_for_kindergarten.pdf
    • http://gixipures.sportsontheweb.net/32176594221.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zotitutuxizokox.epizy.com/application_for_casual_leave_letter.pdf
    • https://uploads.strikinglycdn.com/files/9a93b279-8ce4-4e90-a6bb-9821cd8277af/kitchenaid_superba_microwave_light_not_working.pdf
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_ce9f4e69191c4e6095aabf7b397b7ffb.pdf?index=true
    • http://zotuxegusam.epizy.com/33563762783.pdf
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_5c824e66593744e592bf49afee404320.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01defae7-87ce-494c-82c3-5a0dfd10b6ea/voganinese.pdf
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_8a429aa794ff40e8848516162a565b6e.pdf?index=true
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_fb7cc68ea4ab4117b7d544400586c940.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0123a16-87f5-40fe-ae43-c3eecdd70caa/tijinomadoxe.pdf
    • https://uploads.strikinglycdn.com/files/9a5bc5be-8c5b-4ab8-b6d1-96e2f1b056ae/kuwegegugejunobu.pdf
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_9b2aecd758904ecb8431f6e4ab509ee6.pdf?index=true
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_4b3e42a430bd462bacb9b97d70f836fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7935920-f084-4fd6-8a1a-7f897a3977a7/democracy_and_education_john_dewey.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_3e8d86bc6b7b4697997b9ba4269bea74.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_1ac152d60f8e4bcd9a7a23e2accd70e2.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_off0000f03b.bin
74a6467024799f084c59eb2de99b6a1e2b3337694fd50ee9a917d8db79c4382f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 5348 bytes
font_01_sfnt_off00010265.bin
ae37ea14bbac6487bf20152a081825e8855409836a98a43eb39af7e0bef3e1fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 11208 bytes

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