Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9e02a875f8d231…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 20:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 459f59a1719a676833c802ceb6cbb2c3 SHA-1: 12bf5da0d6f59a69952b4f1e9fc476cb16a40e65 SHA-256: 1d9e02a875f8d231a7e7ccc2ec4d1e5dcff4f263b71f31067fbcd49c26a27594
96 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 point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious or deceptive content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://vilenefex.ru/strik?utm_term=what+is+the+theme+of+the+story+the+monkey%2527s+paw
    • http://nakanilo.club/tigolozodenabemye9zr.pdf
    • http://tersq.space/79854277524cdryc.pdf
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/1838179.pdf
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/zetepenomum_zuzozasagef_gexozasuruxe.pdf
    • http://wutugavefezaza.22web.org/what_is_the_best_encyclopedia_online.pdf
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/jewojevet_numajorilazik_jaris.pdf
    • http://leree4.club/zuxisezonennjum3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_24d5f4c731a44d998e0cfef33dbd8906.pdf?index=true
    • http://favekagopu.epizy.com/electrocardiograma_anormal.pdf
    • https://uploads.strikinglycdn.com/files/97131f10-d86f-4d8d-aecc-50a24e2a3aaf/79191693064.pdf
    • https://uploads.strikinglycdn.com/files/7aaaf3df-d3c4-4f0b-ba58-d2b5ac01615d/calories_in_one_bob_evans_biscuit.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_6e4eff88d9354719a00b57bfebfe2e7d.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_9fe947ab73a947378c5765c6b6a6537e.pdf?index=true
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_250d3a5a9b08455eae710570788a9b89.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aa519baa-ee4b-497f-907f-80d2698e3fcb/what_is_the_climax_in_the_story_of_life_of_pi.pdf
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_3e8a14de82694e5eb990c57a32663ffa.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_off0000dc32.bin
aad94b449ce522292411a12a759cbf62aa225ce3162cc86fec87072f617202fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 5412 bytes
font_01_sfnt_off0000ee90.bin
3c8c70e95e172d87f88249f6e98f5fcd1d779dd22b9512bb6276049fa774e71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 1940 bytes
font_02_sfnt_off0000f7c8.bin
737e2d0af36381ff44538adc896c2cd548ded4b6abf8d31820edbcc88e725a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10244 bytes

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