Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01e9cf4552b9645…

MALICIOUS

PDF

78.8 KB Created: 2021-03-06 09:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8004fe7c5eef9232e5f38e99de42fe9d SHA-1: 212b9fed07d2063c4aa82f303d9683cb46ef1ddf SHA-256: b01e9cf4552b964559d78a0d979e846c5802858b4bfb9ef3c099bc5a79824d37
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 pointing to suspicious domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/123?utm_term=ged+practice+test+math+fractions
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/lorepulubitatop-lapexekaxateg-bonori-megiti.pdf
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/5067782.pdf
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/6483875.pdf
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/f6f8c2.pdf
    • https://mifabawir.weebly.com/uploads/1/3/0/7/130776047/5423141.pdf
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/gusizivekexetuki.pdf
    • https://gugeropufil.weebly.com/uploads/1/3/0/8/130874104/nizinazowi-dutav-xibirevubafeka.pdf
    • http://bedomukuruxe.22web.org/2197314110.pdf
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/xobofutetu-nofate.pdf
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/dexeneriva-nulepefeli-zusenulisavep.pdf
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/boror.pdf
    • http://nafewid.sportsontheweb.net/texas_health_and_safety_code_481.115c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6cc82d9b-0f91-4eea-b571-fa14fda8d62e/keurig_2.0_filter_replacement_instructions.pdf
    • https://uploads.strikinglycdn.com/files/7eaeb1f8-668c-4d86-b661-3c6ec90479b0/python_for_data_science_and_machine_learning_bootcamp_freecoursesite.pdf
    • http://wuzuzifo.epizy.com/joxorumafebibatusubefike.pdf
    • http://gugujis.epizy.com/59922952869.pdf
    • http://kozifina.epizy.com/ruwewigelixox.pdf
    • https://uploads.strikinglycdn.com/files/c6d34b26-cb89-423d-b9a9-361e69215343/types_of_exercise_classes_for_seniors.pdf
    • http://xeroxuzowi.epizy.com/35791061390.pdf
    • https://uploads.strikinglycdn.com/files/c25bd946-771e-4d8f-9322-80592e21f942/47314816632.pdf
    • https://uploads.strikinglycdn.com/files/5ae0ada4-5b15-43e1-80b8-3ab5f94404bc/functional_analysis_examples.pdf
    • https://uploads.strikinglycdn.com/files/94e6f8cc-f879-44e8-8561-dac1f653a3c9/how_to_clean_lint_out_of_bosch_dryer.pdf
    • https://uploads.strikinglycdn.com/files/78b7ff72-4870-4b4d-bf20-f3aadb208012/52146812173.pdf
    • https://uploads.strikinglycdn.com/files/ed2c50d0-aa85-498f-b806-de1dee2e7e59/limapid.pdf
    • http://vavadot.onlinewebshop.net/97298227052.pdf
    • 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_off0000e818.bin
4bd244a33c8d1a7259718c61e3c401d23c0c21a56587b54a2ea5cc323a10f09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5180 bytes
font_01_sfnt_off0000f991.bin
c761e94d2384297570ece17194a0722bd93279d9076e07fbb8c0f4d6c30765fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 11116 bytes
font_02_sfnt_off00011f7e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 4324 bytes

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