Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5db3147182d064b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 21:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada33f4628cb66ad30c8e4f8b2e76cb0 SHA-1: be494b67d829f75c59087eae749cae98086c8a8b SHA-256: e5db3147182d064b36f1dee1ec64ca939439300a902f6ef060a5e5af1ab1021a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm designed to improve search engine rankings for terms like 'gta iv mobile edition apk'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and extensive link farm are indicative of a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=gta+iv+mobile+edition+apk
    • https://cdn.sqhk.co/jigugabopu/HoLjcij/megidi.pdf
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fe766708451f.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_5fe95e89c641d.pdf
    • http://zesisoxesevi.22web.org/what_are_the_methods_and_techniques_of_language_teaching.pdf
    • https://cdn.sqhk.co/lididiregi/8U4ijhe/losidopima.pdf
    • https://static.s123-cdn-static.com/uploads/4410002/normal_60048d059a03c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/242d8b70-0c61-400f-a8c4-5072967e6e6a/ponanulanunakiveru.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_cb612a9b727a49cdb4a52ee7567eef20.pdf?index=true
    • http://bawavejukedosuv.epizy.com/adobe_flash_player_apk_pc.pdf
    • http://fozipifi.epizy.com/tesedefenaxolapo.pdf
    • https://uploads.strikinglycdn.com/files/372c37bc-e462-44de-8695-bf3ce088f92c/vowoxat.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_0ed98c11972b416288f7024b0c1eb02a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a57d5a1d-90bc-4c3f-9662-078a4bdfbcc2/how_to_pair_brother_printer_with_mac.pdf
    • https://uploads.strikinglycdn.com/files/b2743193-436e-4b28-a10a-c0796355c423/89491898123.pdf
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_a9cc2b40aaef431cb36b98822acb3974.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_off0000eb45.bin
1ba9b790e4cc1289fe00d5fc4a5492056ce883487cfa79e08b60ca1877abe946		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 5128 bytes
font_01_sfnt_off0000fcae.bin
b8e3fe7fc21c0bfb0e03d4b4bd4fe7660b7c3c3068a7c9efa20402dcd4bb4e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 22960 bytes

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