Malicious PDF — malware analysis report

Static analysis result for SHA-256 876e6ec037f999b7…

MALICIOUS

PDF

37.1 KB Created: 2020-10-02 02:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a0d07ffd14d7b7a95392711628d6aa7 SHA-1: 6430eba8fc5cabc11fa97580e8c51f7a9853dde3 SHA-256: 876e6ec037f999b798a2ae8891aaa0810629981f85d9ad295628b4e0bdbdee0f
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary purpose is to lure the user to a malicious site, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=triveni+steam+turbine+operation+manual In PDF document text
    • https://site-1039725.mozfiles.com/files/1039725/17354073968.pdfIn PDF document text
    • https://site-1040142.mozfiles.com/files/1040142/29005923409.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/loviki.pdfIn PDF document text
    • https://site-1040609.mozfiles.com/files/1040609/17017863523.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/zarekepujeguf.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/88049054978.pdfIn PDF document text
    • https://site-1036923.mozfiles.com/files/1036923/piwulodijusiwar.pdfIn PDF document text
    • https://site-1037907.mozfiles.com/files/1037907/66179366967.pdfIn PDF document text
    • https://site-1039740.mozfiles.com/files/1039740/wotutakanatedinowimug.pdfIn PDF document text
    • http://pifoxajem.mrmaynardreading.com/uploads/1/3/1/6/131637016/welemuwamutato-xamuzitoxuf.pdfIn PDF document text
    • http://files.theblendedfamilyfoundation.com/uploads/1/3/1/4/131437755/woxufu-liwurezu-fukajunuve.pdfIn PDF document text
    • http://files.mwdesigning.com/uploads/1/3/1/1/131164063/zemowid.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/bevowelexa.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/pikirakifiludemejudajez.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/76593765135.pdfIn PDF document text
    • http://www.thecrimsonmiami.com/download/ge-steam-turbine-maintenaIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E37 5116 bytes
SHA-256: fdd9989dc384b0fd7be94ee751af5a3f9ece68672f6525e52717fd47d0154b1b
font_01_sfnt_off00005f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F83 12700 bytes
SHA-256: 81960e0a0c66a917276f02eb179208e558724cdb918fa4f95f47834b77c3f002

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